xref: /third_party/skia/third_party/externals/microhttpd/doc/libmicrohttpd.info

This is libmicrohttpd.info, produced by makeinfo version 5.2 from
libmicrohttpd.texi.

This manual is for GNU libmicrohttpd (version 0.9.42, 3 April 2015), a
library for embedding an HTTP(S) server into C applications.

   Copyright (C) 2007-2013 Christian Grothoff

     Permission is granted to copy, distribute and/or modify this
     document under the terms of the GNU Free Documentation License,
     Version 1.3 or any later version published by the Free Software
     Foundation; with no Invariant Sections, no Front-Cover Texts, and
     no Back-Cover Texts.  A copy of the license is included in the
     section entitled "GNU Free Documentation License".
INFO-DIR-SECTION Software libraries
START-INFO-DIR-ENTRY
* libmicrohttpd: (libmicrohttpd).       Embedded HTTP server library.
END-INFO-DIR-ENTRY


File: libmicrohttpd.info,  Node: Top,  Next: microhttpd-intro,  Up: (dir)

The GNU libmicrohttpd Library
*****************************

This manual is for GNU libmicrohttpd (version 0.9.42, 3 April 2015), a
library for embedding an HTTP(S) server into C applications.

   Copyright (C) 2007-2013 Christian Grothoff

     Permission is granted to copy, distribute and/or modify this
     document under the terms of the GNU Free Documentation License,
     Version 1.3 or any later version published by the Free Software
     Foundation; with no Invariant Sections, no Front-Cover Texts, and
     no Back-Cover Texts.  A copy of the license is included in the
     section entitled "GNU Free Documentation License".

* Menu:

* microhttpd-intro::            Introduction.
* microhttpd-const::            Constants.
* microhttpd-struct::           Structures type definition.
* microhttpd-cb::               Callback functions definition.
* microhttpd-init::             Starting and stopping the server.
* microhttpd-inspect::          Implementing external 'select'.
* microhttpd-requests::         Handling requests.
* microhttpd-responses::        Building responses to requests.
* microhttpd-flow::             Flow control.
* microhttpd-dauth::            Utilizing Authentication.
* microhttpd-post::             Adding a 'POST' processor.
* microhttpd-info::             Obtaining and modifying status information.
* microhttpd-util::             Utilities.

Appendices

* GNU-LGPL::                     The GNU Lesser General Public License says how you
                                 can copy and share almost all of 'libmicrohttpd'.
* GNU GPL with eCos Extension::  The GNU General Public License with eCos extension says how you
                                 can copy and share some parts of 'libmicrohttpd'.
* GNU-FDL::                     The GNU Free Documentation License says how you
                                can copy and share the documentation of 'libmicrohttpd'.

Indices

* Concept Index::               Index of concepts and programs.
* Function and Data Index::     Index of functions, variables and data types.
* Type Index::                  Index of data types.


File: libmicrohttpd.info,  Node: microhttpd-intro,  Next: microhttpd-const,  Prev: Top,  Up: Top

1 Introduction
**************

All symbols defined in the public API start with 'MHD_'.  MHD is a small
HTTP daemon library.  As such, it does not have any API for logging
errors (you can only enable or disable logging to stderr).  Also, it may
not support all of the HTTP features directly, where applicable,
portions of HTTP may have to be handled by clients of the library.

   The library is supposed to handle everything that it must handle
(because the API would not allow clients to do this), such as basic
connection management; however, detailed interpretations of headers --
such as range requests -- and HTTP methods are left to clients.  The
library does understand 'HEAD' and will only send the headers of the
response and not the body, even if the client supplied a body.  The
library also understands headers that control connection management
(specifically, 'Connection: close' and 'Expect: 100 continue' are
understood and handled automatically).

   MHD understands 'POST' data and is able to decode certain formats (at
the moment only 'application/x-www-form-urlencoded' and
'multipart/form-data') using the post processor API. The data stream of
a POST is also provided directly to the main application, so unsupported
encodings could still be processed, just not conveniently by MHD.

   The header file defines various constants used by the HTTP protocol.
This does not mean that MHD actually interprets all of these values.
The provided constants are exported as a convenience for users of the
library.  MHD does not verify that transmitted HTTP headers are part of
the standard specification; users of the library are free to define
their own extensions of the HTTP standard and use those with MHD.

   All functions are guaranteed to be completely reentrant and
thread-safe.  MHD checks for allocation failures and tries to recover
gracefully (for example, by closing the connection).  Additionally,
clients can specify resource limits on the overall number of
connections, number of connections per IP address and memory used per
connection to avoid resource exhaustion.

1.1 Scope
=========

MHD is currently used in a wide range of implementations.  Examples
based on reports we've received from developers include:
   * Embedded HTTP server on a cortex M3 (128 KB code space)
   * Large-scale multimedia server (reportedly serving at the simulator
     limit of 7.5 GB/s)
   * Administrative console (via HTTP/HTTPS) for network appliances

1.2 Thread modes and event loops
================================

MHD supports four basic thread modes and up to three event loop styes.

   The four basic thread modes are external (MHD creates no threads,
event loop is fully managed by the application), internal (MHD creates
one thread for all connections), thread pool (MHD creates a thread pool
which is used to process all connections) and thread-per-connection (MHD
creates one listen thread and then one thread per accepted connection).

   These thread modes are then combined with the event loop styles.  MHD
support select, poll and epoll.  epoll is only available on Linux, poll
may not be available on some platforms.  Note that it is possible to
combine MHD using epoll with an external select-based event loop.

   The default (if no other option is passed) is "external select".  The
highest performance can typically be obtained with a thread pool using
'epoll'.  Apache Benchmark (ab) was used to compare the performance of
'select' and 'epoll' when using a thread pool and a large number of
connections.  *note Figure 1.1: fig:performance. shows the resulting
plot from the 'benchmark.c' example, which measures the latency between
an incoming request and the completion of the transmission of the
response.  In this setting, the 'epoll' thread pool with four threads
was able to handle more than 45,000 connections per second on loopback
(with Apache Benchmark running three processes on the same machine).

[image src="performance_data.png" alt="Data"]

Figure 1.1: Performance measurements for select vs.  epoll (with
thread-pool).

   Not all combinations of thread modes and event loop styles are
supported.  This is partially to keep the API simple, and partially
because some combinations simply make no sense as others are strictly
superior.  Note that the choice of style depends fist of all on the
application logic, and then on the performance requirements.
Applications that perform a blocking operation while handling a request
within the callbacks from MHD must use a thread per connection.  This is
typically rather costly.  Applications that do not support threads or
that must run on embedded devices without thread-support must use the
external mode.  Using 'epoll' is only supported on Linux, thus portable
applications must at least have a fallback option available.  *note
Table 1.1: tbl:supported. lists the sane combinations.

                        select   poll   epoll
external                yes      no     yes
internal                yes      yes    yes
thread pool             yes      yes    yes
thread-per-connection   yes      yes    no

Table 1.1: Supported combinations of event styles and thread modes.

1.3 Compiling GNU libmicrohttpd
===============================

MHD uses the standard GNU system where the usual build process involves
running
$ ./configure
$ make
$ make install

   MHD supports various options to be given to configure to tailor the
binary to a specific situation.  Note that some of these options will
remove portions of the MHD code that are required for
binary-compatibility.  They should only be used on embedded systems with
tight resource constraints and no concerns about library versioning.
Standard distributions including MHD are expected to always ship with
all features enabled, otherwise unexpected incompatibilities can arise!

   Here is a list of MHD-specific options that can be given to configure
(canonical configure options such as "-prefix" are also supported, for a
full list of options run "./configure -help"):

'``--disable-curl'''
     disable running testcases using libcurl

'``--disable-largefile'''
     disable support for 64-bit files

'``--disable-messages'''
     disable logging of error messages (smaller binary size, not so much
     fun for debugging)

'``--disable-https'''
     disable HTTPS support, even if GNUtls is found; this option must be
     used if eCOS license is desired as an option (in all cases the
     resulting binary falls under a GNU LGPL-only license)

'``--disable-postprocessor'''
     do not include the post processor API (results in binary
     incompatibility)

'``--disable-dauth'''
     do not include the authentication APIs (results in binary
     incompatibility)

'``--disable-epoll'
     do not include epoll support, even on Linux (minimally smaller
     binary size, good for testing portability to non-Linux systems)

'``--enable-coverage'''
     set flags for analysis of code-coverage with gcc/gcov (results in
     slow, large binaries)

'``--with-gcrypt=PATH'''
     specifies path to libgcrypt installation

'``--with-gnutls=PATH'''
     specifies path to libgnutls installation

1.4 Validity of pointers
========================

MHD will give applications access to its internal data structures via
pointers via arguments and return values from its API. This creates the
question as to how long those pointers are assured to stay valid.

   Most MHD data structures are associated with the connection of an
HTTP client.  Thus, pointers associated with a connection are typically
valid until the connection is finished, at which point MHD will call the
'MHD_RequestCompletedCallback' if one is registered.  Applications that
have such a callback registered may assume that keys and values from the
'MHD_KeyValueIterator', return values from 'MHD_lookup_connection_value'
and the 'url', 'method' and 'version' arguments to the
'MHD_AccessHandlerCallback' will remain valid until the respective
'MHD_RequestCompletedCallback' is invoked.

   In contrast, the 'upload_data' argument of
'MHD_RequestCompletedCallback' as well as all pointers from the
'MHD_PostDataIterator' are only valid for the duration of the callback.

   Pointers returned from 'MHD_get_response_header' are valid as long as
the response itself is valid.

1.5 Including the microhttpd.h header
=====================================

Ideally, before including "microhttpd.h" you should add the necessary
includes to define the 'uint64_t', 'size_t', 'fd_set', 'socklen_t' and
'struct sockaddr' data types.  Which specific headers are needed may
depend on your platform and your build system might include some tests
to provide you with the necessary conditional operations.  For possible
suggestions consult 'platform.h' and 'configure.ac' in the MHD
distribution.

   Once you have ensured that you manually (!)  included the right
headers for your platform before "microhttpd.h", you should also add a
line with '#define MHD_PLATFORM_H' which will prevent the "microhttpd.h"
header from trying (and, depending on your platform, failing) to include
the right headers.

   If you do not define MHD_PLATFORM_H, the "microhttpd.h" header will
automatically include headers needed on GNU/Linux systems (possibly
causing problems when porting to other platforms).

1.6 SIGPIPE
===========

MHD does not install a signal handler for SIGPIPE. On platforms where
this is possible (such as GNU/Linux), it disables SIGPIPE for its I/O
operations (by passing MSG_NOSIGNAL). On other platforms, SIGPIPE
signals may be generated from network operations by MHD and will cause
the process to die unless the developer explicitly installs a signal
handler for SIGPIPE.

   Hence portable code using MHD must install a SIGPIPE handler or
explicitly block the SIGPIPE signal.  MHD does not do so in order to
avoid messing with other parts of the application that may need to
handle SIGPIPE in a particular way.  You can make your application
handle SIGPIPE by calling the following function in 'main':

static void
catcher (int sig)
{
}

static void
ignore_sigpipe ()
{
  struct sigaction oldsig;
  struct sigaction sig;

  sig.sa_handler = &catcher;
  sigemptyset (&sig.sa_mask);
#ifdef SA_INTERRUPT
  sig.sa_flags = SA_INTERRUPT;  /* SunOS */
#else
  sig.sa_flags = SA_RESTART;
#endif
  if (0 != sigaction (SIGPIPE, &sig, &oldsig))
    fprintf (stderr,
             "Failed to install SIGPIPE handler: %s\n", strerror (errno));
}

1.7 MHD_UNSIGNED_LONG_LONG
==========================

Some platforms do not support 'long long'.  Hence MHD defines a macro
'MHD_UNSIGNED LONG_LONG' which will default to 'unsigned long long'.
For standard desktop operating systems, this is all you need to know.

   However, if your platform does not support 'unsigned long long', you
should change "platform.h" to define 'MHD_LONG_LONG' and
'MHD_UNSIGNED_LONG_LONG' to an appropriate alternative type and also
define 'MHD_LONG_LONG_PRINTF' and 'MHD_UNSIGNED_LONG_LONG_PRINTF' to the
corresponding format string for printing such a data type.  Note that
the "signed" versions are deprecated.  Also, for historical reasons,
'MHD_LONG_LONG_PRINTF' is without the percent sign, whereas
'MHD_UNSIGNED_LONG_LONG_PRINTF' is with the percent sign.  Newly written
code should only use the unsigned versions.  However, you need to define
both in "platform.h" if you need to change the definition for the
specific platform.

1.8 Portability to W32
======================

libmicrohttpd in general ported well to W32.  Most libmicrohttpd
features are supported.  W32 do not support some functions, like epoll
and corresponding MHD features are not available on W32.

1.9 Portability to z/OS
=======================

To compile MHD on z/OS, extract the archive and run

iconv -f UTF-8 -t IBM-1047 contrib/ascebc > /tmp/ascebc.sh
chmod +x /tmp/ascebc.sh
for n in `find * -type f`
do
  /tmp/ascebc.sh $n
done
   to convert all source files to EBCDIC. Note that you must run
'configure' from the directory where the configure script is located.
Otherwise, configure will fail to find the 'contrib/xcc' script (which
is a wrapper around the z/OS c89 compiler).


File: libmicrohttpd.info,  Node: microhttpd-const,  Next: microhttpd-struct,  Prev: microhttpd-intro,  Up: Top

2 Constants
***********

 -- Enumeration: MHD_FLAG
     Options for the MHD daemon.

     Note that if neither 'MHD_USE_THREAD_PER_CONNECTION' nor
     'MHD_USE_SELECT_INTERNALLY' is used, the client wants control over
     the process and will call the appropriate microhttpd callbacks.

     Starting the daemon may also fail if a particular option is not
     implemented or not supported on the target platform (i.e.  no
     support for SSL, threads or IPv6).  SSL support generally depends
     on options given during MHD compilation.  Threaded operations
     (including 'MHD_USE_SELECT_INTERNALLY') are not supported on
     Symbian.

     'MHD_NO_FLAG'
          No options selected.

     'MHD_USE_DEBUG'
          Run in debug mode.  If this flag is used, the library should
          print error messages and warnings to stderr.  Note that for
          this run-time option to have any effect, MHD needs to be
          compiled with messages enabled.  This is done by default
          except you ran configure with the '--disable-messages' flag
          set.

     'MHD_USE_SSL'
          Run in HTTPS-mode.  If you specify 'MHD_USE_SSL' and MHD was
          compiled without SSL support, 'MHD_start_daemon' will return
          NULL.

     'MHD_USE_THREAD_PER_CONNECTION'
          Run using one thread per connection.

     'MHD_USE_SELECT_INTERNALLY'
          Run using an internal thread doing 'SELECT'.

     'MHD_USE_IPv6'
          Run using the IPv6 protocol (otherwise, MHD will just support
          IPv4).  If you specify 'MHD_USE_IPV6' and the local platform
          does not support it, 'MHD_start_daemon' will return NULL.

          If you want MHD to support IPv4 and IPv6 using a single
          socket, pass MHD_USE_DUAL_STACK, otherwise, if you only pass
          this option, MHD will try to bind to IPv6-only (resulting in
          no IPv4 support).

     'MHD_USE_DUAL_STACK'
          Use a single socket for IPv4 and IPv6.  Note that this will
          mean that IPv4 addresses are returned by MHD in the
          IPv6-mapped format (the 'struct sockaddr_in6' format will be
          used for IPv4 and IPv6).

     'MHD_USE_PEDANTIC_CHECKS'
          Be pedantic about the protocol (as opposed to as tolerant as
          possible).  Specifically, at the moment, this flag causes MHD
          to reject HTTP 1.1 connections without a 'Host' header.  This
          is required by the standard, but of course in violation of the
          "be as liberal as possible in what you accept" norm.  It is
          recommended to turn this *ON* if you are testing clients
          against MHD, and *OFF* in production.

     'MHD_USE_POLL'
          Use poll instead of select.  This allows sockets with
          descriptors '>= FD_SETSIZE'.  This option currently only works
          in conjunction with 'MHD_USE_THREAD_PER_CONNECTION' or
          'MHD_USE_INTERNAL_SELECT' (at this point).  If you specify
          'MHD_USE_POLL' and the local platform does not support it,
          'MHD_start_daemon' will return NULL.

     'MHD_USE_EPOLL_LINUX_ONLY'
          Use epoll instead of poll or select.  This allows sockets with
          descriptors '>= FD_SETSIZE'.  This option is only available on
          Linux systems and only works in conjunction with
          'MHD_USE_THREAD_PER_CONNECTION' (at this point).  If you
          specify 'MHD_USE_EPOLL_LINUX_ONLY' and the local platform does
          not support it, 'MHD_start_daemon' will return NULL. Using
          epoll instead of select or poll can in some situations result
          in significantly higher performance as the system call has
          fundamentally lower complexity (O(1) for epoll vs.  O(n) for
          select/poll where n is the number of open connections).

     'MHD_SUPPRESS_DATE_NO_CLOCK'
          Suppress (automatically) adding the 'Date:' header to HTTP
          responses.  This option should ONLY be used on systems that do
          not have a clock and that DO provide other mechanisms for
          cache control.  See also RFC 2616, section 14.18 (exception
          3).

     'MHD_USE_NO_LISTEN_SOCKET'
          Run the HTTP server without any listen socket.  This option
          only makes sense if 'MHD_add_connection' is going to be used
          exclusively to connect HTTP clients to the HTTP server.  This
          option is incompatible with using a thread pool; if it is
          used, 'MHD_OPTION_THREAD_POOL_SIZE' is ignored.

     'MHD_USE_PIPE_FOR_SHUTDOWN'
          Force MHD to use a signal pipe to notify the event loop (of
          threads) of our shutdown.  This is required if an appliction
          uses 'MHD_USE_INTERNAL_SELECT' or
          'MHD_USE_THREAD_PER_CONNECTION' and then performs
          'MHD_quiesce_daemon' (which eliminates our ability to signal
          termination via the listen socket).  In these modes,
          'MHD_quiesce_daemon' will fail if this option was not set.
          Also, use of this option is automatic (as in, you do not even
          have to specify it), if 'MHD_USE_NO_LISTEN_SOCKET' is
          specified.  In "external" select mode, this option is always
          simply ignored.

     'MHD_USE_SUSPEND_RESUME'
          Enables using 'MHD_suspend_connection' and
          'MHD_resume_connection', as performing these calls requires
          some additional pipes to be created, and code not using these
          calls should not pay the cost.

     'MHD_USE_TCP_FASTOPEN'
          Enable TCP_FASTOPEN on the listen socket.  TCP_FASTOPEN is
          currently supported on Linux >= 3.6.  On other systems using
          this option with cause 'MHD_start_daemon' to fail.

 -- Enumeration: MHD_OPTION
     MHD options.  Passed in the varargs portion of
     'MHD_start_daemon()'.

     'MHD_OPTION_END'
          No more options / last option.  This is used to terminate the
          VARARGs list.

     'MHD_OPTION_CONNECTION_MEMORY_LIMIT'
          Maximum memory size per connection (followed by a 'size_t').
          The default is 32 kB (32*1024 bytes) as defined by the
          internal constant 'MHD_POOL_SIZE_DEFAULT'.  Values above 128k
          are unlikely to result in much benefit, as half of the memory
          will be typically used for IO, and TCP buffers are unlikely to
          support window sizes above 64k on most systems.

     'MHD_OPTION_CONNECTION_MEMORY_INCREMENT'
          Increment to use for growing the read buffer (followed by a
          'size_t').  The default is 1024 (bytes).  Increasing this
          value will make MHD use memory for reading more aggressively,
          which can reduce the number of 'recvfrom' calls but may
          increase the number of 'sendto' calls.  The given value must
          fit within MHD_OPTION_CONNECTION_MEMORY_LIMIT.

     'MHD_OPTION_CONNECTION_LIMIT'
          Maximum number of concurrent connections to accept (followed
          by an 'unsigned int').  The default is 'FD_SETSIZE - 4' (the
          maximum number of file descriptors supported by 'select' minus
          four for 'stdin', 'stdout', 'stderr' and the server socket).
          In other words, the default is as large as possible.

          Note that if you set a low connection limit, you can easily
          get into trouble with browsers doing request pipelining.  For
          example, if your connection limit is "1", a browser may open a
          first connection to access your "index.html" file, keep it
          open but use a second connection to retrieve CSS files, images
          and the like.  In fact, modern browsers are typically by
          default configured for up to 15 parallel connections to a
          single server.  If this happens, MHD will refuse to even
          accept the second connection until the first connection is
          closed -- which does not happen until timeout.  As a result,
          the browser will fail to render the page and seem to hang.  If
          you expect your server to operate close to the connection
          limit, you should first consider using a lower timeout value
          and also possibly add a "Connection: close" header to your
          response to ensure that request pipelining is not used and
          connections are closed immediately after the request has
          completed:
               MHD_add_response_header (response,
                                        MHD_HTTP_HEADER_CONNECTION,
                                        "close");

     'MHD_OPTION_CONNECTION_TIMEOUT'
          After how many seconds of inactivity should a connection
          automatically be timed out?  (followed by an 'unsigned int';
          use zero for no timeout).  The default is zero (no timeout).

     'MHD_OPTION_NOTIFY_COMPLETED'
          Register a function that should be called whenever a request
          has been completed (this can be used for application-specific
          clean up).  Requests that have never been presented to the
          application (via 'MHD_AccessHandlerCallback()') will not
          result in notifications.

          This option should be followed by *TWO* pointers.  First a
          pointer to a function of type 'MHD_RequestCompletedCallback()'
          and second a pointer to a closure to pass to the request
          completed callback.  The second pointer maybe 'NULL'.

     'MHD_OPTION_NOTIFY_CONNECTION'
          Register a function that should be called when the TCP
          connection to a client is opened or closed.  Note that
          'MHD_OPTION_NOTIFY_COMPLETED' and the 'con_cls' argument to
          the 'MHD_AccessHandlerCallback' are per HTTP request (and
          there can be multiple HTTP requests per TCP connection).  The
          registered callback is called twice per TCP connection, with
          'MHD_CONNECTION_NOTIFY_STARTED' and
          'MHD_CONNECTION_NOTIFY_CLOSED' respectively.  An additional
          argument can be used to store TCP connection specific
          information, which can be retrieved using
          'MHD_CONNECTION_INFO_SOCKET_CONTEXT' during the lifetime of
          the TCP connection.  The respective location is not the same
          as the HTTP-request-specific 'con_cls' from the
          'MHD_AccessHandlerCallback'.

          This option should be followed by *TWO* pointers.  First a
          pointer to a function of type 'MHD_NotifyConnectionCallback()'
          and second a pointer to a closure to pass to the request
          completed callback.  The second pointer maybe 'NULL'.

     'MHD_OPTION_PER_IP_CONNECTION_LIMIT'
          Limit on the number of (concurrent) connections made to the
          server from the same IP address.  Can be used to prevent one
          IP from taking over all of the allowed connections.  If the
          same IP tries to establish more than the specified number of
          connections, they will be immediately rejected.  The option
          should be followed by an 'unsigned int'.  The default is zero,
          which means no limit on the number of connections from the
          same IP address.

     'MHD_OPTION_SOCK_ADDR'
          Bind daemon to the supplied socket address.  This option
          should be followed by a 'struct sockaddr *'.  If
          'MHD_USE_IPv6' is specified, the 'struct sockaddr*' should
          point to a 'struct sockaddr_in6', otherwise to a 'struct
          sockaddr_in'.  If this option is not specified, the daemon
          will listen to incoming connections from anywhere.  If you use
          this option, the 'port' argument from 'MHD_start_daemon' is
          ignored and the port from the given 'struct sockaddr *' will
          be used instead.

     'MHD_OPTION_URI_LOG_CALLBACK'
          Specify a function that should be called before parsing the
          URI from the client.  The specified callback function can be
          used for processing the URI (including the options) before it
          is parsed.  The URI after parsing will no longer contain the
          options, which maybe inconvenient for logging.  This option
          should be followed by two arguments, the first one must be of
          the form
                void * my_logger(void * cls, const char * uri, struct MHD_Connection *con)
          where the return value will be passed as '*con_cls' in calls
          to the 'MHD_AccessHandlerCallback' when this request is
          processed later; returning a value of 'NULL' has no special
          significance; (however, note that if you return non-'NULL',
          you can no longer rely on the first call to the access handler
          having 'NULL == *con_cls' on entry) 'cls' will be set to the
          second argument following MHD_OPTION_URI_LOG_CALLBACK.
          Finally, 'uri' will be the 0-terminated URI of the request.

          Note that during the time of this call, most of the
          connection's state is not initialized (as we have not yet
          parsed he headers).  However, information about the connecting
          client (IP, socket) is available.

     'MHD_OPTION_HTTPS_MEM_KEY'
          Memory pointer to the private key to be used by the HTTPS
          daemon.  This option should be followed by an "const char*"
          argument.  This should be used in conjunction with
          'MHD_OPTION_HTTPS_MEM_CERT'.

     'MHD_OPTION_HTTPS_KEY_PASSWORD'
          Memory pointer to the password that decrypts the private key
          to be used by the HTTPS daemon.  This option should be
          followed by an "const char*" argument.  This should be used in
          conjunction with 'MHD_OPTION_HTTPS_MEM_KEY'.

          The password (or passphrase) is only used immediately during
          'MHD_start_daemon()'.  Thus, the application may want to erase
          it from memory afterwards for additional security.

     'MHD_OPTION_HTTPS_MEM_CERT'
          Memory pointer to the certificate to be used by the HTTPS
          daemon.  This option should be followed by an "const char*"
          argument.  This should be used in conjunction with
          'MHD_OPTION_HTTPS_MEM_KEY'.

     'MHD_OPTION_HTTPS_MEM_TRUST'
          Memory pointer to the CA certificate to be used by the HTTPS
          daemon to authenticate and trust clients certificates.  This
          option should be followed by an "const char*" argument.  The
          presence of this option activates the request of certificate
          to the client.  The request to the client is marked optional,
          and it is the responsibility of the server to check the
          presence of the certificate if needed.  Note that most
          browsers will only present a client certificate only if they
          have one matching the specified CA, not sending any
          certificate otherwise.

     'MHD_OPTION_HTTPS_CRED_TYPE'
          Daemon credentials type.  Either certificate or anonymous,
          this option should be followed by one of the values listed in
          "enum gnutls_credentials_type_t".

     'MHD_OPTION_HTTPS_PRIORITIES'
          SSL/TLS protocol version and ciphers.  This option must be
          followed by an "const char *" argument specifying the SSL/TLS
          protocol versions and ciphers that are acceptable for the
          application.  The string is passed unchanged to
          gnutls_priority_init.  If this option is not specified,
          "NORMAL" is used.

     'MHD_OPTION_HTTPS_CERT_CALLBACK'
          Use a callback to determine which X.509 certificate should be
          used for a given HTTPS connection.  This option should be
          followed by a argument of type
          "gnutls_certificate_retrieve_function2 *".  This option
          provides an alternative to MHD_OPTION_HTTPS_MEM_KEY and
          MHD_OPTION_HTTPS_MEM_CERT. You must use this version if
          multiple domains are to be hosted at the same IP address using
          TLS's Server Name Indication (SNI) extension.  In this case,
          the callback is expected to select the correct certificate
          based on the SNI information provided.  The callback is
          expected to access the SNI data using
          gnutls_server_name_get().  Using this option requires GnuTLS
          3.0 or higher.

     'MHD_OPTION_DIGEST_AUTH_RANDOM'
          Digest Authentication nonce's seed.

          This option should be followed by two arguments.  First an
          integer of type "size_t" which specifies the size of the
          buffer pointed to by the second argument in bytes.  Note that
          the application must ensure that the buffer of the second
          argument remains allocated and unmodified while the daemon is
          running.  For security, you SHOULD provide a fresh random
          nonce when using MHD with Digest Authentication.

     'MHD_OPTION_NONCE_NC_SIZE'

          Size of an array of nonce and nonce counter map.  This option
          must be followed by an "unsigned int" argument that have the
          size (number of elements) of a map of a nonce and a
          nonce-counter.  If this option is not specified, a default
          value of 4 will be used (which might be too small for servers
          handling many requests).  If you do not use digest
          authentication at all, you can specify a value of zero to save
          some memory.

          You should calculate the value of NC_SIZE based on the number
          of connections per second multiplied by your expected session
          duration plus a factor of about two for hash table collisions.
          For example, if you expect 100 digest-authenticated
          connections per second and the average user to stay on your
          site for 5 minutes, then you likely need a value of about
          60000.  On the other hand, if you can only expect only 10
          digest-authenticated connections per second, tolerate browsers
          getting a fresh nonce for each request and expect a HTTP
          request latency of 250 ms, then a value of about 5 should be
          fine.

     'MHD_OPTION_LISTEN_SOCKET'
          Listen socket to use.  Pass a listen socket for MHD to use
          (systemd-style).  If this option is used, MHD will not open
          its own listen socket(s).  The argument passed must be of type
          "int" and refer to an existing socket that has been bound to a
          port and is listening.

     'MHD_OPTION_EXTERNAL_LOGGER'
          Use the given function for logging error messages.  This
          option must be followed by two arguments; the first must be a
          pointer to a function of type 'void fun(void * arg, const char
          * fmt, va_list ap)' and the second a pointer of type 'void*'
          which will be passed as the "arg" argument to "fun".

          Note that MHD will not generate any log messages without the
          MHD_USE_DEBUG flag set and if MHD was compiled with the
          "-disable-messages" flag.

     'MHD_OPTION_THREAD_POOL_SIZE'
          Number (unsigned int) of threads in thread pool.  Enable
          thread pooling by setting this value to to something greater
          than 1.  Currently, thread model must be
          MHD_USE_SELECT_INTERNALLY if thread pooling is enabled
          ('MHD_start_daemon' returns 'NULL' for an unsupported thread
          model).

     'MHD_OPTION_ARRAY'
          This option can be used for initializing MHD using options
          from an array.  A common use for this is writing an FFI for
          MHD. The actual options given are in an array of 'struct
          MHD_OptionItem', so this option requires a single argument of
          type 'struct MHD_OptionItem'.  The array must be terminated
          with an entry 'MHD_OPTION_END'.

          An example for code using MHD_OPTION_ARRAY is:
               struct MHD_OptionItem ops[] = {
                { MHD_OPTION_CONNECTION_LIMIT, 100, NULL },
                { MHD_OPTION_CONNECTION_TIMEOUT, 10, NULL },
                { MHD_OPTION_END, 0, NULL }
               };
               d = MHD_start_daemon(0, 8080, NULL, NULL, dh, NULL,
                                    MHD_OPTION_ARRAY, ops,
                                    MHD_OPTION_END);
          For options that expect a single pointer argument, the second
          member of the 'struct MHD_OptionItem' is ignored.  For options
          that expect two pointer arguments, the first argument must be
          cast to 'intptr_t'.

     'MHD_OPTION_UNESCAPE_CALLBACK'

          Specify a function that should be called for unescaping escape
          sequences in URIs and URI arguments.  Note that this function
          will NOT be used by the MHD_PostProcessor.  If this option is
          not specified, the default method will be used which decodes
          escape sequences of the form "%HH". This option should be
          followed by two arguments, the first one must be of the form

                 size_t my_unescaper(void * cls, struct MHD_Connection *c, char *s)

          where the return value must be 'strlen(s)' and 's' should be
          updated.  Note that the unescape function must not lengthen
          's' (the result must be shorter than the input and still be
          0-terminated).  'cls' will be set to the second argument
          following MHD_OPTION_UNESCAPE_CALLBACK.

     'MHD_OPTION_THREAD_STACK_SIZE'
          Maximum stack size for threads created by MHD. This option
          must be followed by a 'size_t').  Not specifying this option
          or using a value of zero means using the system default (which
          is likely to differ based on your platform).

     'MHD_OPTION_TCP_FASTQUEUE_QUEUE_SIZE'
          When the flag 'MHD_USE_TCP_FASTOPEN' is used, this option sets
          the connection handshake queue size for the TCP FASTOPEN
          connections.  Note that a TCP FASTOPEN connection handshake
          occupies more resources than a TCP handshake as the SYN
          packets also contain DATA which is kept in the associate state
          until handshake is completed.  If this option is not given the
          queue size is set to a default value of 10.  This option must
          be followed by a 'unsigned int'.

     'MHD_OPTION_HTTPS_MEM_DHPARAMS'
          Memory pointer for the Diffie-Hellman parameters (dh.pem) to
          be used by the HTTPS daemon for key exchange.  This option
          must be followed by a 'const char *' argument.  The argument
          would be a zero-terminated string with a PEM encoded PKCS3 DH
          parameters structure suitable for passing to
          'gnutls_dh_parms_import_pkcs3'.

     'MHD_OPTION_LISTENING_ADDRESS_REUSE'
          This option must be followed by a 'unsigned int' argument.  If
          this option is present and true (nonzero) parameter is given,
          allow reusing the address:port of the listening socket (using
          'SO_REUSEPORT' on most platforms, and 'SO_REUSEADDR' on
          Windows).  If a false (zero) parameter is given, disallow
          reusing the the address:port of the listening socket (this
          usually requires no special action, but 'SO_EXCLUSIVEADDRUSE'
          is needed on Windows).  If this option is not present, default
          behaviour is undefined (currently, 'SO_REUSEADDR' is used on
          all platforms, which disallows address:port reusing with the
          exception of Windows).

 -- C Struct: MHD_OptionItem
     Entry in an MHD_OPTION_ARRAY. See the 'MHD_OPTION_ARRAY' option
     argument for its use.

     The 'option' member is used to specify which option is specified in
     the array.  The other members specify the respective argument.

     Note that for options taking only a single pointer, the 'ptr_value'
     member should be set.  For options taking two pointer arguments,
     the first pointer must be cast to 'intptr_t' and both the 'value'
     and the 'ptr_value' members should be used to pass the two
     pointers.

 -- Enumeration: MHD_ValueKind
     The 'MHD_ValueKind' specifies the source of the key-value pairs in
     the HTTP protocol.

     'MHD_RESPONSE_HEADER_KIND'
          Response header.

     'MHD_HEADER_KIND'
          HTTP header.

     'MHD_COOKIE_KIND'
          Cookies.  Note that the original HTTP header containing the
          cookie(s) will still be available and intact.

     'MHD_POSTDATA_KIND'
          'POST' data.  This is available only if a content encoding
          supported by MHD is used (currently only URL encoding), and
          only if the posted content fits within the available memory
          pool.  Note that in that case, the upload data given to the
          'MHD_AccessHandlerCallback()' will be empty (since it has
          already been processed).

     'MHD_GET_ARGUMENT_KIND'
          'GET' (URI) arguments.

     'MHD_FOOTER_KIND'
          HTTP footer (only for http 1.1 chunked encodings).

 -- Enumeration: MHD_RequestTerminationCode
     The 'MHD_RequestTerminationCode' specifies reasons why a request
     has been terminated (or completed).

     'MHD_REQUEST_TERMINATED_COMPLETED_OK'
          We finished sending the response.

     'MHD_REQUEST_TERMINATED_WITH_ERROR'
          Error handling the connection (resources exhausted, other side
          closed connection, application error accepting request, etc.)

     'MHD_REQUEST_TERMINATED_TIMEOUT_REACHED'
          No activity on the connection for the number of seconds
          specified using 'MHD_OPTION_CONNECTION_TIMEOUT'.

     'MHD_REQUEST_TERMINATED_DAEMON_SHUTDOWN'
          We had to close the session since MHD was being shut down.

 -- Enumeration: MHD_ResponseMemoryMode
     The 'MHD_ResponeMemoryMode' specifies how MHD should treat the
     memory buffer given for the response in
     'MHD_create_response_from_buffer'.

     'MHD_RESPMEM_PERSISTENT'
          Buffer is a persistent (static/global) buffer that won't
          change for at least the lifetime of the response, MHD should
          just use it, not free it, not copy it, just keep an alias to
          it.

     'MHD_RESPMEM_MUST_FREE'
          Buffer is heap-allocated with 'malloc' (or equivalent) and
          should be freed by MHD after processing the response has
          concluded (response reference counter reaches zero).

     'MHD_RESPMEM_MUST_COPY'
          Buffer is in transient memory, but not on the heap (for
          example, on the stack or non-malloc allocated) and only valid
          during the call to 'MHD_create_response_from_buffer'.  MHD
          must make its own private copy of the data for processing.

 -- Enumeration: MHD_ResponseFlags
     Response-specific flags.  Passed as an argument to
     'MHD_set_response_options()'.

     'MHD_RF_NONE'
          No special handling.

     'MHD_RF_HTTP_VERSION_1_0_ONLY'
          Only respond in conservative HTTP 1.0-mode.  In particular, do
          not (automatically) sent "Connection" headers and always close
          the connection after generating the response.

 -- Enumeration: MHD_ResponseOptions
     Response-specific options.  Passed in the varargs portion of
     'MHD_set_response_options()'.

     'MHD_RO_END'
          No more options / last option.  This is used to terminate the
          VARARGs list.


File: libmicrohttpd.info,  Node: microhttpd-struct,  Next: microhttpd-cb,  Prev: microhttpd-const,  Up: Top

3 Structures type definition
****************************

 -- C Struct: MHD_Daemon
     Handle for the daemon (listening on a socket for HTTP traffic).

 -- C Struct: MHD_Connection
     Handle for a connection / HTTP request.  With HTTP/1.1, multiple
     requests can be run over the same connection.  However, MHD will
     only show one request per TCP connection to the client at any given
     time.

 -- C Struct: MHD_Response
     Handle for a response.

 -- C Struct: MHD_PostProcessor
     Handle for 'POST' processing.

 -- C Union: MHD_ConnectionInfo
     Information about a connection.

 -- C Union: MHD_DaemonInfo
     Information about an MHD daemon.


File: libmicrohttpd.info,  Node: microhttpd-cb,  Next: microhttpd-init,  Prev: microhttpd-struct,  Up: Top

4 Callback functions definition
*******************************

 -- Function Pointer: int *MHD_AcceptPolicyCallback (void *cls, const
          struct sockaddr * addr, socklen_t addrlen)
     Invoked in the context of a connection to allow or deny a client to
     connect.  This callback return 'MHD_YES' if connection is allowed,
     'MHD_NO' if not.

     CLS
          custom value selected at callback registration time;
     ADDR
          address information from the client;
     ADDRLEN
          length of the address information.

 -- Function Pointer: int *MHD_AccessHandlerCallback (void *cls, struct
          MHD_Connection * connection, const char *url, const char
          *method, const char *version, const char *upload_data, size_t
          *upload_data_size, void **con_cls)
     Invoked in the context of a connection to answer a request from the
     client.  This callback must call MHD functions (example: the
     'MHD_Response' ones) to provide content to give back to the client
     and return an HTTP status code (i.e.  '200' for OK, '404', etc.).

     *note microhttpd-post::, for details on how to code this callback.

     Must return 'MHD_YES' if the connection was handled successfully,
     'MHD_NO' if the socket must be closed due to a serious error while
     handling the request

     CLS
          custom value selected at callback registration time;

     URL
          the URL requested by the client;

     METHOD
          the HTTP method used by the client ('GET', 'PUT', 'DELETE',
          'POST', etc.);

     VERSION
          the HTTP version string (i.e.  'HTTP/1.1');

     UPLOAD_DATA
          the data being uploaded (excluding headers):

          'POST' data *will* be made available incrementally in
          UPLOAD_DATA; even if 'POST' data is available, the first time
          the callback is invoked there won't be upload data, as this is
          done just after MHD parses the headers.  If supported by the
          client and the HTTP version, the application can at this point
          queue an error response to possibly avoid the upload entirely.
          If no response is generated, MHD will (if required)
          automatically send a 100 CONTINUE reply to the client.

          Afterwards, POST data will be passed to the callback to be
          processed incrementally by the application.  The application
          may return 'MHD_NO' to forcefully terminate the TCP connection
          without generating a proper HTTP response.  Once all of the
          upload data has been provided to the application, the
          application will be called again with 0 bytes of upload data.
          At this point, a response should be queued to complete the
          handling of the request.

     UPLOAD_DATA_SIZE
          set initially to the size of the UPLOAD_DATA provided; this
          callback must update this value to the number of bytes *NOT*
          processed; unless external select is used, the callback maybe
          required to process at least some data.  If the callback fails
          to process data in multi-threaded or internal-select mode and
          if the read-buffer is already at the maximum size that MHD is
          willing to use for reading (about half of the maximum amount
          of memory allowed for the connection), then MHD will abort
          handling the connection and return an internal server error to
          the client.  In order to avoid this, clients must be able to
          process upload data incrementally and reduce the value of
          'upload_data_size'.

     CON_CLS
          reference to a pointer, initially set to 'NULL', that this
          callback can set to some address and that will be preserved by
          MHD for future calls for this request;

          since the access handler may be called many times (i.e., for a
          'PUT'/'POST' operation with plenty of upload data) this allows
          the application to easily associate some request-specific
          state;

          if necessary, this state can be cleaned up in the global
          'MHD_RequestCompletedCallback' (which can be set with the
          'MHD_OPTION_NOTIFY_COMPLETED').

 -- Function Pointer: void *MHD_RequestCompletedCallback (void *cls,
          struct MHD_Connectionconnection, void **con_cls, enum
          MHD_RequestTerminationCode toe)
     Signature of the callback used by MHD to notify the application
     about completed requests.

     CLS
          custom value selected at callback registration time;

     CONNECTION
          connection handle;

     CON_CLS
          value as set by the last call to the
          'MHD_AccessHandlerCallback';

     TOE
          reason for request termination see
          'MHD_OPTION_NOTIFY_COMPLETED'.

 -- Function Pointer: int *MHD_KeyValueIterator (void *cls, enum
          MHD_ValueKind kind, const char *key, const char *value)
     Iterator over key-value pairs.  This iterator can be used to
     iterate over all of the cookies, headers, or 'POST'-data fields of
     a request, and also to iterate over the headers that have been
     added to a response.

     CLS
          custom value specified when iteration was triggered;

     KIND
          kind of the header we are looking at

     KEY
          key for the value, can be an empty string

     VALUE
          value corresponding value, can be NULL

     Return 'MHD_YES' to continue iterating, 'MHD_NO' to abort the
     iteration.

 -- Function Pointer: int *MHD_ContentReaderCallback (void *cls,
          uint64_t pos, char *buf, size_t max)
     Callback used by MHD in order to obtain content.  The callback has
     to copy at most MAX bytes of content into BUF.  The total number of
     bytes that has been placed into BUF should be returned.

     Note that returning zero will cause MHD to try again.  Thus,
     returning zero should only be used in conjunction with
     'MHD_suspend_connection()' to avoid busy waiting.

     While usually the callback simply returns the number of bytes
     written into BUF, there are two special return value:

     'MHD_CONTENT_READER_END_OF_STREAM' (-1) should be returned for the
     regular end of transmission (with chunked encoding, MHD will then
     terminate the chunk and send any HTTP footers that might be
     present; without chunked encoding and given an unknown response
     size, MHD will simply close the connection; note that while
     returning 'MHD_CONTENT_READER_END_OF_STREAM' is not technically
     legal if a response size was specified, MHD accepts this and treats
     it just as 'MHD_CONTENT_READER_END_WITH_ERROR'.

     'MHD_CONTENT_READER_END_WITH_ERROR' (-2) is used to indicate a
     server error generating the response; this will cause MHD to simply
     close the connection immediately.  If a response size was given or
     if chunked encoding is in use, this will indicate an error to the
     client.  Note, however, that if the client does not know a response
     size and chunked encoding is not in use, then clients will not be
     able to tell the difference between
     'MHD_CONTENT_READER_END_WITH_ERROR' and
     'MHD_CONTENT_READER_END_OF_STREAM'.  This is not a limitation of
     MHD but rather of the HTTP protocol.

     CLS
          custom value selected at callback registration time;

     POS
          position in the datastream to access; note that if an
          'MHD_Response' object is re-used, it is possible for the same
          content reader to be queried multiple times for the same data;
          however, if an 'MHD_Response' is not re-used, MHD guarantees
          that POS will be the sum of all non-negative return values
          obtained from the content reader so far.

     Return '-1' on error (MHD will no longer try to read content and
     instead close the connection with the client).

 -- Function Pointer: void *MHD_ContentReaderFreeCallback (void *cls)
     This method is called by MHD if we are done with a content reader.
     It should be used to free resources associated with the content
     reader.

 -- Function Pointer: int *MHD_PostDataIterator (void *cls, enum
          MHD_ValueKind kind, const char *key, const char *filename,
          const char *content_type, const char *transfer_encoding, const
          char *data, uint64_t off, size_t size)
     Iterator over key-value pairs where the value maybe made available
     in increments and/or may not be zero-terminated.  Used for
     processing 'POST' data.

     CLS
          custom value selected at callback registration time;

     KIND
          type of the value;

     KEY
          zero-terminated key for the value;

     FILENAME
          name of the uploaded file, 'NULL' if not known;

     CONTENT_TYPE
          mime-type of the data, 'NULL' if not known;

     TRANSFER_ENCODING
          encoding of the data, 'NULL' if not known;

     DATA
          pointer to size bytes of data at the specified offset;

     OFF
          offset of data in the overall value;

     SIZE
          number of bytes in data available.

     Return 'MHD_YES' to continue iterating, 'MHD_NO' to abort the
     iteration.


File: libmicrohttpd.info,  Node: microhttpd-init,  Next: microhttpd-inspect,  Prev: microhttpd-cb,  Up: Top

5 Starting and stopping the server
**********************************

 -- Function: void MHD_set_panic_func (MHD_PanicCallback cb, void *cls)
     Set a handler for fatal errors.

     CB
          function to call if MHD encounters a fatal internal error.  If
          no handler was set explicitly, MHD will call 'abort'.

     CLS
          closure argument for cb; the other arguments are the name of
          the source file, line number and a string describing the
          nature of the fatal error (which can be 'NULL')

 -- Function: struct MHD_Daemon * MHD_start_daemon (unsigned int flags,
          unsigned short port, MHD_AcceptPolicyCallback apc, void
          *apc_cls, MHD_AccessHandlerCallback dh, void *dh_cls, ...)
     Start a webserver on the given port.

     FLAGS
          OR-ed combination of 'MHD_FLAG' values;

     PORT
          port to bind to;

     APC
          callback to call to check which clients will be allowed to
          connect; you can pass 'NULL' in which case connections from
          any IP will be accepted;

     APC_CLS
          extra argument to APC;

     DH
          default handler for all URIs;

     DH_CLS
          extra argument to DH.

     Additional arguments are a list of options (type-value pairs,
     terminated with 'MHD_OPTION_END').  It is mandatory to use
     'MHD_OPTION_END' as last argument, even when there are no
     additional arguments.

     Return 'NULL' on error, handle to daemon on success.

 -- Function: int MHD_quiesce_daemon (struct MHD_Daemon *daemon)
     Stop accepting connections from the listening socket.  Allows
     clients to continue processing, but stops accepting new
     connections.  Note that the caller is responsible for closing the
     returned socket; however, if MHD is run using threads (anything but
     external select mode), it must not be closed until AFTER
     'MHD_stop_daemon' has been called (as it is theoretically possible
     that an existing thread is still using it).

     This function is useful in the special case that a listen socket is
     to be migrated to another process (i.e.  a newer version of the
     HTTP server) while existing connections should continue to be
     processed until they are finished.

     Return '-1' on error (daemon not listening), the handle to the
     listen socket otherwise.

 -- Function: void MHD_stop_daemon (struct MHD_Daemon *daemon)
     Shutdown an HTTP daemon.

 -- Function: int MHD_run (struct MHD_Daemon *daemon)
     Run webserver operations (without blocking unless in client
     callbacks).  This method should be called by clients in combination
     with 'MHD_get_fdset()' if the client-controlled 'select'-method is
     used.

     This function will work for external 'poll' and 'select' mode.
     However, if using external 'select' mode, you may want to instead
     use 'MHD_run_from_select', as it is more efficient.

     DAEMON
          daemon to process connections of

     Return 'MHD_YES' on success, 'MHD_NO' if this daemon was not
     started with the right options for this call.

 -- Function: int MHD_run_from_select (struct MHD_Daemon *daemon, const
          fd_set *read_fd_set, const fd_set *write_fd_set, const fd_set
          *except_fd_set)
     Run webserver operations given sets of ready socket handles.

     This method should be called by clients in combination with
     'MHD_get_fdset' if the client-controlled (external) select method
     is used.

     You can use this function instead of 'MHD_run' if you called
     'select' on the result from 'MHD_get_fdset'.  File descriptors in
     the sets that are not controlled by MHD will be ignored.  Calling
     this function instead of 'MHD_run' is more efficient as MHD will
     not have to call 'select' again to determine which operations are
     ready.

     DAEMON
          daemon to process connections of
     READ_FD_SET
          set of descriptors that must be ready for reading without
          blocking
     WRITE_FD_SET
          set of descriptors that must be ready for writing without
          blocking
     EXCEPT_FD_SET
          ignored, can be NULL

     Return 'MHD_YES' on success, 'MHD_NO' on serious internal errors.

 -- Function: void MHD_add_connection (struct MHD_Daemon *daemon, int
          client_socket, const struct sockaddr *addr, socklen_t addrlen)
     Add another client connection to the set of connections managed by
     MHD. This API is usually not needed (since MHD will accept inbound
     connections on the server socket).  Use this API in special cases,
     for example if your HTTP server is behind NAT and needs to connect
     out to the HTTP client, or if you are building a proxy.

     If you use this API in conjunction with a internal select or a
     thread pool, you must set the option 'MHD_USE_PIPE_FOR_SHUTDOWN' to
     ensure that the freshly added connection is immediately processed
     by MHD.

     The given client socket will be managed (and closed!)  by MHD after
     this call and must no longer be used directly by the application
     afterwards.

     DAEMON
          daemon that manages the connection
     CLIENT_SOCKET
          socket to manage (MHD will expect to receive an HTTP request
          from this socket next).
     ADDR
          IP address of the client
     ADDRLEN
          number of bytes in addr

     This function will return 'MHD_YES' on success, 'MHD_NO' if this
     daemon could not handle the connection (i.e.  malloc failed, etc).
     The socket will be closed in any case; 'errno' is set to indicate
     further details about the error.


File: libmicrohttpd.info,  Node: microhttpd-inspect,  Next: microhttpd-requests,  Prev: microhttpd-init,  Up: Top

6 Implementing external 'select'
********************************

 -- Function: int MHD_get_fdset (struct MHD_Daemon *daemon, fd_set *
          read_fd_set, fd_set * write_fd_set, fd_set * except_fd_set,
          int *max_fd)
     Obtain the 'select()' sets for this daemon.  The daemon's socket is
     added to READ_FD_SET.  The list of currently existent connections
     is scanned and their file descriptors added to the correct set.

     After the call completed successfully: the variable referenced by
     MAX_FD references the file descriptor with highest integer
     identifier.  The variable must be set to zero before invoking this
     function.

     Return 'MHD_YES' on success, 'MHD_NO' if: the arguments are invalid
     (example: 'NULL' pointers); this daemon was not started with the
     right options for this call.

 -- Function: int MHD_get_timeout (struct MHD_Daemon *daemon, unsigned
          long long *timeout)
     Obtain timeout value for select for this daemon (only needed if
     connection timeout is used).  The returned value is how many
     milliseconds 'select' should at most block, not the timeout value
     set for connections.  This function must not be called if the
     'MHD_USE_THREAD_PER_CONNECTION' mode is in use (since then it is
     not meaningful to ask for a timeout, after all, there is
     concurrenct activity).  The function must also not be called by
     user-code if 'MHD_USE_INTERNAL_SELECT' is in use.  In the latter
     case, the behavior is undefined.

     DAEMON
          which daemon to obtain the timeout from.
     TIMEOUT
          will be set to the timeout (in milliseconds).

     Return 'MHD_YES' on success, 'MHD_NO' if timeouts are not used (or
     no connections exist that would necessiate the use of a timeout
     right now).


File: libmicrohttpd.info,  Node: microhttpd-requests,  Next: microhttpd-responses,  Prev: microhttpd-inspect,  Up: Top

7 Handling requests
*******************

 -- Function: int MHD_get_connection_values (struct MHD_Connection
          *connection, enum MHD_ValueKind kind, MHD_KeyValueIterator
          iterator, void *iterator_cls)
     Get all the headers matching KIND from the request.

     The ITERATOR callback is invoked once for each header, with
     ITERATOR_CLS as first argument.  After version 0.9.19, the headers
     are iterated in the same order as they were received from the
     network; previous versions iterated over the headers in reverse
     order.

     'MHD_get_connection_values' returns the number of entries iterated
     over; this can be less than the number of headers if, while
     iterating, ITERATOR returns 'MHD_NO'.

     ITERATOR can be 'NULL': in this case this function just counts and
     returns the number of headers.

     In the case of 'MHD_GET_ARGUMENT_KIND', the VALUE argument will be
     'NULL' if the URL contained a key without an equals operator.  For
     example, for a HTTP request to the URL "http://foo/bar?key", the
     VALUE argument is 'NULL'; in contrast, a HTTP request to the URL
     "http://foo/bar?key=", the VALUE argument is the empty string.  The
     normal case is that the URL contains "http://foo/bar?key=value" in
     which case VALUE would be the string "value" and KEY would contain
     the string "key".

 -- Function: int MHD_set_connection_value (struct MHD_Connection
          *connection, enum MHD_ValueKind kind, const char * key, const
          char * value)
     This function can be used to append an entry to the list of HTTP
     headers of a connection (so that the 'MHD_get_connection_values
     function' will return them - and the MHD PostProcessor will also
     see them).  This maybe required in certain situations (see Mantis
     #1399) where (broken) HTTP implementations fail to supply values
     needed by the post processor (or other parts of the application).

     This function MUST only be called from within the
     MHD_AccessHandlerCallback (otherwise, access maybe improperly
     synchronized).  Furthermore, the client must guarantee that the key
     and value arguments are 0-terminated strings that are NOT freed
     until the connection is closed.  (The easiest way to do this is by
     passing only arguments to permanently allocated strings.).

     CONNECTION is the connection for which the entry for KEY of the
     given KIND should be set to the given VALUE.

     The function returns 'MHD_NO' if the operation could not be
     performed due to insufficient memory and 'MHD_YES' on success.

 -- Function: const char * MHD_lookup_connection_value (struct
          MHD_Connection *connection, enum MHD_ValueKind kind, const
          char *key)
     Get a particular header value.  If multiple values match the KIND,
     return one of them (the "first", whatever that means).  KEY must
     reference a zero-terminated ASCII-coded string representing the
     header to look for: it is compared against the headers using
     'strcasecmp()', so case is ignored.  A value of 'NULL' for KEY can
     be used to lookup 'trailing' values without a key, for example if a
     URI is of the form "http://example.com/?trailer", a KEY of 'NULL'
     can be used to access "tailer" The function returns 'NULL' if no
     matching item was found.


File: libmicrohttpd.info,  Node: microhttpd-responses,  Next: microhttpd-flow,  Prev: microhttpd-requests,  Up: Top

8 Building responses to requests
********************************

Response objects handling by MHD is asynchronous with respect to the
application execution flow.  Instances of the 'MHD_Response' structure
are not associated to a daemon and neither to a client connection: they
are managed with reference counting.

   In the simplest case: we allocate a new 'MHD_Response' structure for
each response, we use it once and finally we destroy it.

   MHD allows more efficient resources usages.

   Example: we allocate a new 'MHD_Response' structure for each response
*kind*, we use it every time we have to give that response and we
finally destroy it only when the daemon shuts down.

* Menu:

* microhttpd-response enqueue:: Enqueuing a response.
* microhttpd-response create::  Creating a response object.
* microhttpd-response headers:: Adding headers to a response.
* microhttpd-response options:: Setting response options.
* microhttpd-response inspect:: Inspecting a response object.


File: libmicrohttpd.info,  Node: microhttpd-response enqueue,  Next: microhttpd-response create,  Up: microhttpd-responses

8.1 Enqueuing a response
========================

 -- Function: int MHD_queue_response (struct MHD_Connection *connection,
          unsigned int status_code, struct MHD_Response *response)
     Queue a response to be transmitted to the client as soon as
     possible but only after MHD_AccessHandlerCallback returns.  This
     function checks that it is legal to queue a response at this time
     for the given connection.  It also increments the internal
     reference counter for the response object (the counter will be
     decremented automatically once the response has been transmitted).

     CONNECTION
          the connection identifying the client;

     STATUS_CODE
          HTTP status code (i.e.  '200' for OK);

     RESPONSE
          response to transmit.

     Return 'MHD_YES' on success or if message has been queued.  Return
     'MHD_NO': if arguments are invalid (example: 'NULL' pointer); on
     error (i.e.  reply already sent).

 -- Function: void MHD_destroy_response (struct MHD_Response *response)
     Destroy a response object and associated resources (decrement the
     reference counter).  Note that MHD may keep some of the resources
     around if the response is still in the queue for some clients, so
     the memory may not necessarily be freed immediately.

   An explanation of reference counting(1):

  1. a 'MHD_Response' object is allocated:

          struct MHD_Response * response = MHD_create_response_from_buffer(...);
          /* here: reference counter = 1 */

  2. the 'MHD_Response' object is enqueued in a 'MHD_Connection':

          MHD_queue_response(connection, , response);
          /* here: reference counter = 2 */

  3. the creator of the response object discharges responsibility for
     it:

          MHD_destroy_response(response);
          /* here: reference counter = 1 */

  4. the daemon handles the connection sending the response's data to
     the client then decrements the reference counter by calling
     'MHD_destroy_response()': the counter's value drops to zero and the
     'MHD_Response' object is released.

   ---------- Footnotes ----------

   (1) Note to readers acquainted to the Tcl API: reference counting on
'MHD_Connection' structures is handled in the same way as Tcl handles
'Tcl_Obj' structures through 'Tcl_IncrRefCount()' and
'Tcl_DecrRefCount()'.


File: libmicrohttpd.info,  Node: microhttpd-response create,  Next: microhttpd-response headers,  Prev: microhttpd-response enqueue,  Up: microhttpd-responses

8.2 Creating a response object
==============================

 -- Function: struct MHD_Response * MHD_create_response_from_callback
          (uint64_t size, size_t block_size, MHD_ContentReaderCallback
          crc, void *crc_cls, MHD_ContentReaderFreeCallback crfc)
     Create a response object.  The response object can be extended with
     header information and then it can be used any number of times.

     SIZE
          size of the data portion of the response, '-1' for unknown;

     BLOCK_SIZE
          preferred block size for querying CRC (advisory only, MHD may
          still call CRC using smaller chunks); this is essentially the
          buffer size used for IO, clients should pick a value that is
          appropriate for IO and memory performance requirements;

     CRC
          callback to use to obtain response data;

     CRC_CLS
          extra argument to CRC;

     CRFC
          callback to call to free CRC_CLS resources.

     Return 'NULL' on error (i.e.  invalid arguments, out of memory).

 -- Function: struct MHD_Response * MHD_create_response_from_fd
          (uint64_t size, int fd)
     Create a response object.  The response object can be extended with
     header information and then it can be used any number of times.

     SIZE
          size of the data portion of the response (should be smaller or
          equal to the size of the file)

     FD
          file descriptor referring to a file on disk with the data;
          will be closed when response is destroyed; note that 'fd' must
          be an actual file descriptor (not a pipe or socket) since MHD
          might use 'sendfile' or 'seek' on it.  The descriptor should
          be in blocking-IO mode.

     Return 'NULL' on error (i.e.  invalid arguments, out of memory).

 -- Function: struct MHD_Response *
          MHD_create_response_from_fd_at_offset (size_t size, int fd,
          off_t offset)
     Create a response object.  The response object can be extended with
     header information and then it can be used any number of times.
     Note that you need to be a bit careful about 'off_t' when writing
     this code.  Depending on your platform, MHD is likely to have been
     compiled with support for 64-bit files.  When you compile your own
     application, you must make sure that 'off_t' is also a 64-bit
     value.  If not, your compiler may pass a 32-bit value as 'off_t',
     which will result in 32-bits of garbage.

     If you use the autotools, use the 'AC_SYS_LARGEFILE' autoconf macro
     and make sure to include the generated 'config.h' file before
     'microhttpd.h' to avoid problems.  If you do not have a build
     system and only want to run on a GNU/Linux system, you could also
     use
     #define _FILE_OFFSET_BITS 64
     #include <sys/types.h>
     #include <sys/stat.h>
     #include <fcntl.h>
     #include <microhttpd.h>
     to ensure 64-bit 'off_t'.  Note that if your operating system does
     not support 64-bit files, MHD will be compiled with a 32-bit
     'off_t' (in which case the above would be wrong).

     SIZE
          size of the data portion of the response (number of bytes to
          transmit from the file starting at offset).

     FD
          file descriptor referring to a file on disk with the data;
          will be closed when response is destroyed; note that 'fd' must
          be an actual file descriptor (not a pipe or socket) since MHD
          might use 'sendfile' or 'seek' on it.  The descriptor should
          be in blocking-IO mode.

     OFFSET
          offset to start reading from in the file

     Return 'NULL' on error (i.e.  invalid arguments, out of memory).

 -- Function: struct MHD_Response * MHD_create_response_from_buffer
          (size_t size, void *data, enum MHD_ResponseMemoryMode mode)
     Create a response object.  The response object can be extended with
     header information and then it can be used any number of times.

     SIZE
          size of the data portion of the response;

     BUFFER
          the data itself;

     MODE
          memory management options for buffer; use
          MHD_RESPMEM_PERSISTENT if the buffer is static/global memory,
          use MHD_RESPMEM_MUST_FREE if the buffer is heap-allocated and
          should be freed by MHD and MHD_RESPMEM_MUST_COPY if the buffer
          is in transient memory (i.e.  on the stack) and must be copied
          by MHD;

     Return 'NULL' on error (i.e.  invalid arguments, out of memory).

 -- Function: struct MHD_Response * MHD_create_response_from_data
          (size_t size, void *data, int must_free, int must_copy)
     Create a response object.  The response object can be extended with
     header information and then it can be used any number of times.
     This function is deprecated, use 'MHD_create_response_from_buffer'
     instead.

     SIZE
          size of the data portion of the response;

     DATA
          the data itself;

     MUST_FREE
          if true: MHD should free data when done;

     MUST_COPY
          if true: MHD allocates a block of memory and use it to make a
          copy of DATA embedded in the returned 'MHD_Response'
          structure; handling of the embedded memory is responsibility
          of MHD; DATA can be released anytime after this call returns.

     Return 'NULL' on error (i.e.  invalid arguments, out of memory).

   Example: create a response from a statically allocated string:

     const char * data = "<html><body><p>Error!</p></body></html>";

     struct MHD_Connection * connection = ...;
     struct MHD_Response *   response;

     response = MHD_create_response_from_buffer (strlen(data), data,
                                                 MHD_RESPMEM_PERSISTENT);
     MHD_queue_response(connection, 404, response);
     MHD_destroy_response(response);


File: libmicrohttpd.info,  Node: microhttpd-response headers,  Next: microhttpd-response options,  Prev: microhttpd-response create,  Up: microhttpd-responses

8.3 Adding headers to a response
================================

 -- Function: int MHD_add_response_header (struct MHD_Response
          *response, const char *header, const char *content)
     Add a header line to the response.  The strings referenced by
     HEADER and CONTENT must be zero-terminated and they are duplicated
     into memory blocks embedded in RESPONSE.

     Notice that the strings must not hold newlines, carriage returns or
     tab chars.

     Return 'MHD_NO' on error (i.e.  invalid header or content format or
     memory allocation error).

 -- Function: int MHD_add_response_footer (struct MHD_Response
          *response, const char *footer, const char *content)
     Add a footer line to the response.  The strings referenced by
     FOOTER and CONTENT must be zero-terminated and they are duplicated
     into memory blocks embedded in RESPONSE.

     Notice that the strings must not hold newlines, carriage returns or
     tab chars.  You can add response footers at any time before
     signalling the end of the response to MHD (not just before calling
     'MHD_queue_response').  Footers are useful for adding cryptographic
     checksums to the reply or to signal errors encountered during data
     generation.  This call was introduced in MHD 0.9.3.

     Return 'MHD_NO' on error (i.e.  invalid header or content format or
     memory allocation error).

 -- Function: int MHD_del_response_header (struct MHD_Response
          *response, const char *header, const char *content)
     Delete a header (or footer) line from the response.  Return
     'MHD_NO' on error (arguments are invalid or no such header known).


File: libmicrohttpd.info,  Node: microhttpd-response options,  Next: microhttpd-response inspect,  Prev: microhttpd-response headers,  Up: microhttpd-responses

8.4 Setting response options
============================

 -- Function: int MHD_set_response_options (struct MHD_Response
          *response, enum MHD_ResponseFlags flags, ...)
     Set special flags and options for a response.

     Calling this functions sets the given flags and options for the
     response.

     RESPONSE
          which response should be modified;

     FLAGS
          flags to set for the response;

     Additional arguments are a list of options (type-value pairs,
     terminated with 'MHD_RO_END').  It is mandatory to use 'MHD_RO_END'
     as last argument, even when there are no additional arguments.

     Return 'MHD_NO' on error, 'MHD_YES' on success.


File: libmicrohttpd.info,  Node: microhttpd-response inspect,  Prev: microhttpd-response options,  Up: microhttpd-responses

8.5 Inspecting a response object
================================

 -- Function: int MHD_get_response_headers (struct MHD_Response
          *response, MHD_KeyValueIterator iterator, void *iterator_cls)
     Get all of the headers added to a response.

     Invoke the ITERATOR callback for each header in the response, using
     ITERATOR_CLS as first argument.  Return number of entries iterated
     over.  ITERATOR can be 'NULL': in this case the function just
     counts headers.

     ITERATOR should not modify the its key and value arguments, unless
     we know what we are doing.

 -- Function: const char * MHD_get_response_header (struct MHD_Response
          *response, const char *key)
     Find and return a pointer to the value of a particular header from
     the response.  KEY must reference a zero-terminated string
     representing the header to look for.  The search is case sensitive.
     Return 'NULL' if header does not exist or KEY is 'NULL'.

     We should not modify the value, unless we know what we are doing.


File: libmicrohttpd.info,  Node: microhttpd-flow,  Next: microhttpd-dauth,  Prev: microhttpd-responses,  Up: Top

9 Flow control.
***************

Sometimes it may be possible that clients upload data faster than an
application can process it, or that an application needs an extended
period of time to generate a response.  If
'MHD_USE_THREAD_PER_CONNECTION' is used, applications can simply deal
with this by performing their logic within the thread and thus
effectively blocking connection processing by MHD. In all other modes,
blocking logic must not be placed within the callbacks invoked by MHD as
this would also block processing of other requests, as a single thread
may be responsible for tens of thousands of connections.

   Instead, applications using thread modes other than
'MHD_USE_THREAD_PER_CONNECTION' should use the following functions to
perform flow control.

 -- Function: int MHD_suspend_connection (struct MHD_Connection
          *connection)
     Suspend handling of network data for a given connection.  This can
     be used to dequeue a connection from MHD's event loop (external
     select, internal select or thread pool; not applicable to
     thread-per-connection!)  for a while.

     If you use this API in conjunction with a internal select or a
     thread pool, you must set the option 'MHD_USE_SUSPEND_RESUME' to
     ensure that a resumed connection is immediately processed by MHD.

     Suspended connections continue to count against the total number of
     connections allowed (per daemon, as well as per IP, if such limits
     are set).  Suspended connections will NOT time out; timeouts will
     restart when the connection handling is resumed.  While a
     connection is suspended, MHD will not detect disconnects by the
     client.

     The only safe time to suspend a connection is from the
     'MHD_AccessHandlerCallback'.

     Finally, it is an API violation to call 'MHD_stop_daemon' while
     having suspended connections (this will at least create memory and
     socket leaks or lead to undefined behavior).  You must explicitly
     resume all connections before stopping the daemon.

     CONNECTION
          the connection to suspend

 -- Function: int MHD_resume_connection (struct MHD_Connection
          *connection)
     Resume handling of network data for suspended connection.  It is
     safe to resume a suspended connection at any time.  Calling this
     function on a connection that was not previously suspended will
     result in undefined behavior.

     CONNECTION
          the connection to resume


File: libmicrohttpd.info,  Node: microhttpd-dauth,  Next: microhttpd-post,  Prev: microhttpd-flow,  Up: Top

10 Utilizing Authentication
***************************

MHD support three types of client authentication.

   Basic authentication uses a simple authentication method based on
BASE64 algorithm.  Username and password are exchanged in clear between
the client and the server, so this method must only be used for
non-sensitive content or when the session is protected with https.  When
using basic authentication MHD will have access to the clear password,
possibly allowing to create a chained authentication toward an external
authentication server.

   Digest authentication uses a one-way authentication method based on
MD5 hash algorithm.  Only the hash will transit over the network, hence
protecting the user password.  The nonce will prevent replay attacks.
This method is appropriate for general use, especially when https is not
used to encrypt the session.

   Client certificate authentication uses a X.509 certificate from the
client.  This is the strongest authentication mechanism but it requires
the use of HTTPS. Client certificate authentication can be used
simultaneously with Basic or Digest Authentication in order to provide a
two levels authentication (like for instance separate machine and user
authentication).  A code example for using client certificates is
presented in the MHD tutorial.

* Menu:

* microhttpd-dauth basic:: Using Basic Authentication.
* microhttpd-dauth digest:: Using Digest Authentication.


File: libmicrohttpd.info,  Node: microhttpd-dauth basic,  Next: microhttpd-dauth digest,  Up: microhttpd-dauth

10.1 Using Basic Authentication
===============================

 -- Function: char * MHD_basic_auth_get_username_password (struct
          MHD_Connection *connection, char** password)
     Get the username and password from the basic authorization header
     sent by the client.  Return 'NULL' if no username could be found, a
     pointer to the username if found.  If returned value is not 'NULL',
     the value must be 'free()''ed.

     PASSWORD reference a buffer to store the password.  It can be
     'NULL'.  If returned value is not 'NULL', the value must be
     'free()''ed.

 -- Function: int MHD_queue_basic_auth_fail_response (struct
          MHD_Connection *connection, const char *realm, struct
          MHD_Response *response)
     Queues a response to request basic authentication from the client.
     Return 'MHD_YES' if successful, otherwise 'MHD_NO'.

     REALM must reference to a zero-terminated string representing the
     realm.

     RESPONSE a response structure to specify what shall be presented to
     the client with a 401 HTTP status.


File: libmicrohttpd.info,  Node: microhttpd-dauth digest,  Prev: microhttpd-dauth basic,  Up: microhttpd-dauth

10.2 Using Digest Authentication
================================

 -- Function: char * MHD_digest_auth_get_username (struct MHD_Connection
          *connection)
     Find and return a pointer to the username value from the request
     header.  Return 'NULL' if the value is not found or header does not
     exist.  If returned value is not 'NULL', the value must be
     'free()''ed.

 -- Function: int MHD_digest_auth_check (struct MHD_Connection
          *connection, const char *realm, const char *username, const
          char *password, unsigned int nonce_timeout)
     Checks if the provided values in the WWW-Authenticate header are
     valid and sound according to RFC2716.  If valid return 'MHD_YES',
     otherwise return 'MHD_NO'.

     REALM must reference to a zero-terminated string representing the
     realm.

     USERNAME must reference to a zero-terminated string representing
     the username, it is usually the returned value from
     MHD_digest_auth_get_username.

     PASSWORD must reference to a zero-terminated string representing
     the password, most probably it will be the result of a lookup of
     the username against a local database.

     NONCE_TIMEOUT is the amount of time in seconds for a nonce to be
     invalid.  Most of the time it is sound to specify 300 seconds as
     its values.

 -- Function: int MHD_queue_auth_fail_response (struct MHD_Connection
          *connection, const char *realm, const char *opaque, struct
          MHD_Response *response, int signal_stale)
     Queues a response to request authentication from the client, return
     'MHD_YES' if successful, otherwise 'MHD_NO'.

     REALM must reference to a zero-terminated string representing the
     realm.

     OPAQUE must reference to a zero-terminated string representing a
     value that gets passed to the client and expected to be passed
     again to the server as-is.  This value can be a hexadecimal or
     base64 string.

     RESPONSE a response structure to specify what shall be presented to
     the client with a 401 HTTP status.

     SIGNAL_STALE a value that signals "stale=true" in the response
     header to indicate the invalidity of the nonce and no need to ask
     for authentication parameters and only a new nonce gets generated.
     'MHD_YES' to generate a new nonce, 'MHD_NO' to ask for
     authentication parameters.

   Example: handling digest authentication requests and responses.

     #define PAGE "<html><head><title>libmicrohttpd demo</title></head><body>Access granted</body></html>"
     #define DENIED "<html><head><title>libmicrohttpd demo</title></head><body>Access denied</body></html>"
     #define OPAQUE "11733b200778ce33060f31c9af70a870ba96ddd4"

     static int
     ahc_echo (void *cls,
               struct MHD_Connection *connection,
               const char *url,
               const char *method,
               const char *version,
               const char *upload_data, size_t *upload_data_size, void **ptr)
     {
       struct MHD_Response *response;
       char *username;
       const char *password = "testpass";
       const char *realm = "test@example.com";
       int ret;

       username = MHD_digest_auth_get_username(connection);
       if (username == NULL)
         {
           response = MHD_create_response_from_buffer(strlen (DENIED),
     					         DENIED,
     					         MHD_RESPMEM_PERSISTENT);
           ret = MHD_queue_auth_fail_response(connection, realm,
     					 OPAQUE,
     					 response,
     					 MHD_NO);
           MHD_destroy_response(response);
           return ret;
         }
       ret = MHD_digest_auth_check(connection, realm,
     			      username,
     			      password,
     			      300);
       free(username);
       if ( (ret == MHD_INVALID_NONCE) ||
            (ret == MHD_NO) )
         {
           response = MHD_create_response_from_buffer(strlen (DENIED),
     					         DENIED,
     					         MHD_RESPMEM_PERSISTENT);
           if (NULL == response)
     	return MHD_NO;
           ret = MHD_queue_auth_fail_response(connection, realm,
     					 OPAQUE,
     					 response,
     					 (ret == MHD_INVALID_NONCE) ? MHD_YES : MHD_NO);
           MHD_destroy_response(response);
           return ret;
         }
       response = MHD_create_response_from_buffer (strlen(PAGE), PAGE,
      					      MHD_RESPMEM_PERSISTENT);
       ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
       MHD_destroy_response(response);
       return ret;
     }


File: libmicrohttpd.info,  Node: microhttpd-post,  Next: microhttpd-info,  Prev: microhttpd-dauth,  Up: Top

11 Adding a 'POST' processor
****************************

* Menu:

* microhttpd-post api::         Programming interface for the
                                'POST' processor.

MHD provides the post processor API to make it easier for applications
to parse the data of a client's 'POST' request: the
'MHD_AccessHandlerCallback' will be invoked multiple times to process
data as it arrives; at each invocation a new chunk of data must be
processed.  The arguments UPLOAD_DATA and UPLOAD_DATA_SIZE are used to
reference the chunk of data.

   When 'MHD_AccessHandlerCallback' is invoked for a new connection: its
'*CON_CLS' argument is set to 'NULL'.  When 'POST' data comes in the
upload buffer it is *mandatory* to use the CON_CLS to store a reference
to per-connection data.  The fact that the pointer was initially 'NULL'
can be used to detect that this is a new request.

   One method to detect that a new connection was established is to set
'*con_cls' to an unused integer:

     int
     access_handler (void *cls,
                     struct MHD_Connection * connection,
                     const char *url,
                     const char *method, const char *version,
                     const char *upload_data, size_t *upload_data_size,
                     void **con_cls)
     {
       static int old_connection_marker;
       int new_connection = (NULL == *con_cls);

       if (new_connection)
         {
           /* new connection with POST */
           *con_cls = &old_connection_marker;
         }

       ...
     }

In contrast to the previous example, for 'POST' requests in particular,
it is more common to use the value of '*con_cls' to keep track of actual
state used during processing, such as the post processor (or a struct
containing a post processor):

     int
     access_handler (void *cls,
                     struct MHD_Connection * connection,
                     const char *url,
                     const char *method, const char *version,
                     const char *upload_data, size_t *upload_data_size,
                     void **con_cls)
     {
       struct MHD_PostProcessor * pp = *con_cls;

       if (pp == NULL)
         {
           pp = MHD_create_post_processor(connection, ...);
           *con_cls = pp;
           return MHD_YES;
         }
       if (*upload_data_size)
         {
           MHD_post_process(pp, upload_data, *upload_data_size);
           *upload_data_size = 0;
           return MHD_YES;
         }
       else
         {
           MHD_destroy_post_processor(pp);
           return MHD_queue_response(...);
         }
     }

   Note that the callback from 'MHD_OPTION_NOTIFY_COMPLETED' should be
used to destroy the post processor.  This cannot be done inside of the
access handler since the connection may not always terminate normally.


File: libmicrohttpd.info,  Node: microhttpd-post api,  Up: microhttpd-post

11.1 Programming interface for the 'POST' processor
===================================================

 -- Function: struct MHD_PostProcessor * MHD_create_post_processor
          (struct MHD_Connection *connection, size_t buffer_size,
          MHD_PostDataIterator iterator, void *iterator_cls)
     Create a PostProcessor.  A PostProcessor can be used to
     (incrementally) parse the data portion of a 'POST' request.

     CONNECTION
          the connection on which the 'POST' is happening (used to
          determine the 'POST' format);

     BUFFER_SIZE
          maximum number of bytes to use for internal buffering (used
          only for the parsing, specifically the parsing of the keys).
          A tiny value (256-1024) should be sufficient; do *NOT* use a
          value smaller than 256; for good performance, use 32k or 64k
          (i.e.  65536).

     ITERATOR
          iterator to be called with the parsed data; must *NOT* be
          'NULL';

     ITERATOR_CLS
          custom value to be used as first argument to ITERATOR.

     Return 'NULL' on error (out of memory, unsupported encoding),
     otherwise a PP handle.

 -- Function: int MHD_post_process (struct MHD_PostProcessor *pp, const
          char *post_data, size_t post_data_len)
     Parse and process 'POST' data.  Call this function when 'POST' data
     is available (usually during an 'MHD_AccessHandlerCallback') with
     the UPLOAD_DATA and UPLOAD_DATA_SIZE.  Whenever possible, this will
     then cause calls to the 'MHD_IncrementalKeyValueIterator'.

     PP
          the post processor;

     POST_DATA
          POST_DATA_LEN bytes of 'POST' data;

     POST_DATA_LEN
          length of POST_DATA.

     Return 'MHD_YES' on success, 'MHD_NO' on error (out-of-memory,
     iterator aborted, parse error).

 -- Function: int MHD_destroy_post_processor (struct MHD_PostProcessor
          *pp)
     Release PostProcessor resources.  After this function is being
     called, the PostProcessor is guaranteed to no longer call its
     iterator.  There is no special call to the iterator to indicate the
     end of the post processing stream.  After destroying the
     PostProcessor, the programmer should perform any necessary work to
     complete the processing of the iterator.

     Return 'MHD_YES' if processing completed nicely, 'MHD_NO' if there
     were spurious characters or formatting problems with the post
     request.  It is common to ignore the return value of this function.


File: libmicrohttpd.info,  Node: microhttpd-info,  Next: microhttpd-util,  Prev: microhttpd-post,  Up: Top

12 Obtaining and modifying status information.
**********************************************

* Menu:

* microhttpd-info daemon::        State information about an MHD daemon
* microhttpd-info conn::          State information about a connection
* microhttpd-option conn::        Modify per-connection options


File: libmicrohttpd.info,  Node: microhttpd-info daemon,  Next: microhttpd-info conn,  Up: microhttpd-info

12.1 Obtaining state information about an MHD daemon
====================================================

 -- Function: const union MHD_DaemonInfo * MHD_get_daemon_info (struct
          MHD_Daemon *daemon, enum MHD_DaemonInfoType infoType, ...)
     Obtain information about the given daemon.  This function is
     currently not fully implemented.

     DAEMON
          the daemon about which information is desired;

     INFOTYPE
          type of information that is desired

     ...
          additional arguments about the desired information (depending
          on infoType)

     Returns a union with the respective member (depending on infoType)
     set to the desired information), or 'NULL' in case the desired
     information is not available or applicable.

 -- Enumeration: MHD_DaemonInfoType
     Values of this enum are used to specify what information about a
     daemon is desired.
     'MHD_DAEMON_INFO_KEY_SIZE'
          Request information about the key size for a particular cipher
          algorithm.  The cipher algorithm should be passed as an extra
          argument (of type 'enum MHD_GNUTLS_CipherAlgorithm').  No
          longer supported, using this value will cause
          'MHD_get_daemon_info' to return NULL.

     'MHD_DAEMON_INFO_MAC_KEY_SIZE'
          Request information about the key size for a particular cipher
          algorithm.  The cipher algorithm should be passed as an extra
          argument (of type 'enum MHD_GNUTLS_HashAlgorithm').  No longer
          supported, using this value will cause 'MHD_get_daemon_info'
          to return NULL.

     'MHD_DAEMON_INFO_LISTEN_FD'
          Request the file-descriptor number that MHD is using to listen
          to the server socket.  This can be useful if no port was
          specified and a client needs to learn what port is actually
          being used by MHD. No extra arguments should be passed.

     'MHD_DAEMON_INFO_EPOLL_FD_LINUX_ONLY'
          Request the file-descriptor number that MHD is using for
          epoll.  If the build is not supporting epoll, NULL is
          returned; if we are using a thread pool or this daemon was not
          started with 'MHD_USE_EPOLL_LINUX_ONLY', (a pointer to) -1 is
          returned.  If we are using 'MHD_USE_SELECT_INTERNALLY' or are
          in 'external' select mode, the internal epoll FD is returned.
          This function must be used in external select mode with epoll
          to obtain the FD to call epoll on.  No extra arguments should
          be passed.

     'MHD_DAEMON_INFO_CURRENT_CONNECTIONS'
          Request the number of current connections handled by the
          daemon.  No extra arguments should be passed and a pointer to
          a 'union MHD_DaemonInfo' value is returned, with the
          'num_connections' member of type 'unsigned int' set to the
          number of active connections.

          Note that in multi-threaded or internal-select mode, the real
          number of current connections may already be different when
          'MHD_get_daemon_info' returns.  The number of current
          connections can be used (even in multi-threaded and
          internal-select mode) after 'MHD_quiesce_daemon' to detect
          whether all connections have been handled.


File: libmicrohttpd.info,  Node: microhttpd-info conn,  Next: microhttpd-option conn,  Prev: microhttpd-info daemon,  Up: microhttpd-info

12.2 Obtaining state information about a connection
===================================================

 -- Function: const union MHD_ConnectionInfo * MHD_get_connection_info
          (struct MHD_Connection *daemon, enum MHD_ConnectionInfoType
          infoType, ...)
     Obtain information about the given connection.

     CONNECTION
          the connection about which information is desired;

     INFOTYPE
          type of information that is desired

     ...
          additional arguments about the desired information (depending
          on infoType)

     Returns a union with the respective member (depending on infoType)
     set to the desired information), or 'NULL' in case the desired
     information is not available or applicable.

 -- Enumeration: MHD_ConnectionInfoType
     Values of this enum are used to specify what information about a
     connection is desired.

     'MHD_CONNECTION_INFO_CIPHER_ALGO'
          What cipher algorithm is being used (HTTPS connections only).
          Takes no extra arguments.  'NULL' is returned for non-HTTPS
          connections.

     'MHD_CONNECTION_INFO_PROTOCOL,'
          Takes no extra arguments.  Allows finding out the TLS/SSL
          protocol used (HTTPS connections only).  'NULL' is returned
          for non-HTTPS connections.

     'MHD_CONNECTION_INFO_CLIENT_ADDRESS'
          Returns information about the address of the client.  Returns
          essentially a 'struct sockaddr **' (since the API returns a
          'union MHD_ConnectionInfo *' and that union contains a 'struct
          sockaddr *').

     'MHD_CONNECTION_INFO_GNUTLS_SESSION,'
          Takes no extra arguments.  Allows access to the underlying
          GNUtls session, including access to the underlying GNUtls
          client certificate (HTTPS connections only).  Takes no extra
          arguments.  'NULL' is returned for non-HTTPS connections.

     'MHD_CONNECTION_INFO_GNUTLS_CLIENT_CERT,'
          Dysfunctional (never implemented, deprecated).  Use
          MHD_CONNECTION_INFO_GNUTLS_SESSION to get the
          'gnutls_session_t' and then call
          'gnutls_certificate_get_peers()'.

     'MHD_CONNECTION_INFO_DAEMON'
          Returns information about 'struct MHD_Daemon' which manages
          this connection.

     'MHD_CONNECTION_INFO_CONNECTION_FD'
          Returns the file descriptor (usually a TCP socket) associated
          with this connection (in the "connect-fd" member of the
          returned struct).  Note that manipulating the descriptor
          directly can have problematic consequences (as in, break
          HTTP). Applications might use this access to manipulate TCP
          options, for example to set the "TCP-NODELAY" option for
          COMET-like applications.  Note that MHD will set TCP-CORK
          after sending the HTTP header and clear it after finishing the
          footers automatically (if the platform supports it).  As the
          connection callbacks are invoked in between, those might be
          used to set different values for TCP-CORK and TCP-NODELAY in
          the meantime.

     'MHD_CONNECTION_INFO_SOCKET_CONTEXT'
          Returns the client-specific pointer to a 'void *' that was
          (possibly) set during a 'MHD_NotifyConnectionCallback' when
          the socket was first accepted.  Note that this is NOT the same
          as the 'con_cls' argument of the 'MHD_AccessHandlerCallback'.
          The 'con_cls' is fresh for each HTTP request, while the
          'socket_context' is fresh for each socket.


File: libmicrohttpd.info,  Node: microhttpd-option conn,  Prev: microhttpd-info conn,  Up: microhttpd-info

12.3 Setting custom options for an individual connection
========================================================

 -- Function: int MHD_set_connection_option (struct MHD_Connection
          *daemon, enum MHD_CONNECTION_OPTION option, ...)
     Set a custom option for the given connection.

     CONNECTION
          the connection for which an option should be set or modified;

     OPTION
          option to set

     ...
          additional arguments for the option (depending on option)

     Returns 'MHD_YES' on success, 'MHD_NO' for errors (i.e.  option
     argument invalid or option unknown).

 -- Enumeration: MHD_CONNECTION_OPTION
     Values of this enum are used to specify which option for a
     connection should be changed.

     'MHD_CONNECTION_OPTION_TIMEOUT'
          Set a custom timeout for the given connection.  Specified as
          the number of seconds, given as an 'unsigned int'.  Use zero
          for no timeout.


File: libmicrohttpd.info,  Node: microhttpd-util,  Next: GNU-LGPL,  Prev: microhttpd-info,  Up: Top

13 Utility functions.
*********************

* Menu:

* microhttpd-util feature::       Test supported MHD features
* microhttpd-util unescape::      Unescape strings


File: libmicrohttpd.info,  Node: microhttpd-util feature,  Next: microhttpd-util unescape,  Up: microhttpd-util

13.1 Testing for supported MHD features
=======================================

 -- Enumeration: MHD_FEATURE
     Values of this enum are used to specify what information about a
     daemon is desired.
     'MHD_FEATURE_MESSAGES'
          Get whether messages are supported.  If supported then in
          debug mode messages can be printed to stderr or to external
          logger.

     'MHD_FEATURE_SSL'
          Get whether HTTPS is supported.  If supported then flag
          MHD_USE_SSL and options MHD_OPTION_HTTPS_MEM_KEY,
          MHD_OPTION_HTTPS_MEM_CERT, MHD_OPTION_HTTPS_MEM_TRUST,
          MHD_OPTION_HTTPS_MEM_DHPARAMS, MHD_OPTION_HTTPS_CRED_TYPE,
          MHD_OPTION_HTTPS_PRIORITIES can be used.

     'MHD_FEATURE_HTTPS_CERT_CALLBACK'
          Get whether option #MHD_OPTION_HTTPS_CERT_CALLBACK is
          supported.

     'MHD_FEATURE_IPv6'
          Get whether IPv6 is supported.  If supported then flag
          MHD_USE_IPv6 can be used.

     'MHD_FEATURE_IPv6_ONLY'
          Get whether IPv6 without IPv4 is supported.  If not supported
          then IPv4 is always enabled in IPv6 sockets and flag
          MHD_USE_DUAL_STACK if always used when MHD_USE_IPv6 is
          specified.

     'MHD_FEATURE_POLL'
          Get whether 'poll()' is supported.  If supported then flag
          MHD_USE_POLL can be used.

     'MHD_FEATURE_EPOLL'
          Get whether 'epoll()' is supported.  If supported then Flags
          MHD_USE_EPOLL_LINUX_ONLY and
          MHD_USE_EPOLL_INTERNALLY_LINUX_ONLY can be used.

     'MHD_FEATURE_SHUTDOWN_LISTEN_SOCKET'
          Get whether shutdown on listen socket to signal other threads
          is supported.  If not supported flag MHD_USE_PIPE_FOR_SHUTDOWN
          is automatically forced.

     'MHD_FEATURE_SOCKETPAIR'
          Get whether a 'socketpair()' is used internally instead of a
          'pipe()' to signal other threads.

     'MHD_FEATURE_TCP_FASTOPEN'
          Get whether TCP Fast Open is supported.  If supported then
          flag MHD_USE_TCP_FASTOPEN and option
          MHD_OPTION_TCP_FASTOPEN_QUEUE_SIZE can be used.

     'MHD_FEATURE_BASIC_AUTH'
          Get whether HTTP Basic authorization is supported.  If
          supported then functions
          'MHD_basic_auth_get_username_password()' and
          'MHD_queue_basic_auth_fail_response()' can be used.

     'MHD_FEATURE_DIGEST_AUTH'
          Get whether HTTP Digest authorization is supported.  If
          supported then options MHD_OPTION_DIGEST_AUTH_RANDOM,
          MHD_OPTION_NONCE_NC_SIZE and functions
          'MHD_digest_auth_check()', can be used.

     'MHD_FEATURE_POSTPROCESSOR'
          Get whether postprocessor is supported.  If supported then
          functions 'MHD_create_post_processor()', 'MHD_post_process()',
          'MHD_destroy_post_processor()' can be used.

 -- Function: int MHD_is_feature_supported (enum MHD_FEATURE feature)
     Get information about supported MHD features.  Indicate that MHD
     was compiled with or without support for particular feature.  Some
     features require additional support by the kernel.  However, kernel
     support is not checked by this function.

     FEATURE
          type of requested information

     Returns 'MHD_YES' if the feature is supported, and 'MHD_NO' if not.


File: libmicrohttpd.info,  Node: microhttpd-util unescape,  Prev: microhttpd-util feature,  Up: microhttpd-util

13.2 Unescape strings
=====================

 -- Function: size_t MHD_http_unescape (char *val)
     Process escape sequences ('%HH') Updates val in place; the result
     should be UTF-8 encoded and cannot be larger than the input.  The
     result must also still be 0-terminated.

     VAL
          value to unescape (modified in the process), must be a
          0-terminated UTF-8 string.

     Returns length of the resulting val ('strlen(val)' may be shorter
     afterwards due to elimination of escape sequences).


File: libmicrohttpd.info,  Node: GNU-LGPL,  Next: GNU GPL with eCos Extension,  Prev: microhttpd-util,  Up: Top

GNU-LGPL
********

                      Version 2.1, February 1999

     Copyright (C) 1991, 1999 Free Software Foundation, Inc.
     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA

     Everyone is permitted to copy and distribute verbatim copies
     of this license document, but changing it is not allowed.

     [This is the first released version of the Lesser GPL.  It also counts
     as the successor of the GNU Library Public License, version 2, hence the
     version number 2.1.]

Preamble
--------

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  8. You may not copy, modify, sublicense, link with, or distribute the
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  9. You are not required to accept this License, since you have not
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  11. If, as a consequence of a court judgment or allegation of patent
     infringement or for any other reason (not limited to patent
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     If any portion of this section is held invalid or unenforceable
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     patents or other property right claims or to contest validity of
     any such claims; this section has the sole purpose of protecting
     the integrity of the free software distribution system which is
     implemented by public license practices.  Many people have made
     generous contributions to the wide range of software distributed
     through that system in reliance on consistent application of that
     system; it is up to the author/donor to decide if he or she is
     willing to distribute software through any other system and a
     licensee cannot impose that choice.

     This section is intended to make thoroughly clear what is believed
     to be a consequence of the rest of this License.

  12. If the distribution and/or use of the Library is restricted in
     certain countries either by patents or by copyrighted interfaces,
     the original copyright holder who places the Library under this
     License may add an explicit geographical distribution limitation
     excluding those countries, so that distribution is permitted only
     in or among countries not thus excluded.  In such case, this
     License incorporates the limitation as if written in the body of
     this License.

  13. The Free Software Foundation may publish revised and/or new
     versions of the Lesser General Public License from time to time.
     Such new versions will be similar in spirit to the present version,
     but may differ in detail to address new problems or concerns.

     Each version is given a distinguishing version number.  If the
     Library specifies a version number of this License which applies to
     it and "any later version", you have the option of following the
     terms and conditions either of that version or of any later version
     published by the Free Software Foundation.  If the Library does not
     specify a license version number, you may choose any version ever
     published by the Free Software Foundation.

  14. If you wish to incorporate parts of the Library into other free
     programs whose distribution conditions are incompatible with these,
     write to the author to ask for permission.  For software which is
     copyrighted by the Free Software Foundation, write to the Free
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     decision will be guided by the two goals of preserving the free
     status of all derivatives of our free software and of promoting the
     sharing and reuse of software generally.

                              NO WARRANTY

  15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
     WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE
     LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS
     AND/OR OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY
     OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
     PERFORMANCE OF THE LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE
     DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR
     OR CORRECTION.

  16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
     WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY
     MODIFY AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE
     LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
     INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
     INABILITY TO USE THE LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF
     DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU
     OR THIRD PARTIES OR A FAILURE OF THE LIBRARY TO OPERATE WITH ANY
     OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN
     ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

END OF TERMS AND CONDITIONS
---------------------------

How to Apply These Terms to Your New Libraries
----------------------------------------------

If you develop a new library, and you want it to be of the greatest
possible use to the public, we recommend making it free software that
everyone can redistribute and change.  You can do so by permitting
redistribution under these terms (or, alternatively, under the terms of
the ordinary General Public License).

   To apply these terms, attach the following notices to the library.
It is safest to attach them to the start of each source file to most
effectively convey the exclusion of warranty; and each file should have
at least the "copyright" line and a pointer to where the full notice is
found.

     ONE LINE TO GIVE THE LIBRARY'S NAME AND AN IDEA OF WHAT IT DOES.
     Copyright (C) YEAR  NAME OF AUTHOR

     This library is free software; you can redistribute it and/or modify it
     under the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 2.1 of the License, or (at
     your option) any later version.

     This library is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.

     You should have received a copy of the GNU Lesser General Public
     License along with this library; if not, write to the Free Software
     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
     USA.

   Also add information on how to contact you by electronic and paper
mail.

   You should also get your employer (if you work as a programmer) or
your school, if any, to sign a "copyright disclaimer" for the library,
if necessary.  Here is a sample; alter the names:

     Yoyodyne, Inc., hereby disclaims all copyright interest in the library
     `Frob' (a library for tweaking knobs) written by James Random Hacker.

     SIGNATURE OF TY COON, 1 April 1990
     Ty Coon, President of Vice

   That's all there is to it!


File: libmicrohttpd.info,  Node: GNU GPL with eCos Extension,  Next: GNU-FDL,  Prev: GNU-LGPL,  Up: Top

GNU GPL with eCos Extension
***************************

                         Version 2, June 1991

     Copyright (C) 1989, 1991 Free Software Foundation, Inc.
     59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

     Everyone is permitted to copy and distribute verbatim copies
     of this license document, but changing it is not allowed.

Preamble
--------

The licenses for most software are designed to take away your freedom to
share and change it.  By contrast, the GNU General Public License is
intended to guarantee your freedom to share and change free software--to
make sure the software is free for all its users.  This General Public
License applies to most of the Free Software Foundation's software and
to any other program whose authors commit to using it.  (Some other Free
Software Foundation software is covered by the GNU Library General
Public License instead.)  You can apply it to your programs, too.

   When we speak of free software, we are referring to freedom, not
price.  Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it if
you want it, that you can change the software or use pieces of it in new
free programs; and that you know you can do these things.

   To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
distribute copies of the software, or if you modify it.

   For example, if you distribute copies of such a program, whether
gratis or for a fee, you must give the recipients all the rights that
you have.  You must make sure that they, too, receive or can get the
source code.  And you must show them these terms so they know their
rights.

   We protect your rights with two steps: (1) copyright the software,
and (2) offer you this license which gives you legal permission to copy,
distribute and/or modify the software.

   Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
software.  If the software is modified by someone else and passed on, we
want its recipients to know that what they have is not the original, so
that any problems introduced by others will not reflect on the original
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   Finally, any free program is threatened constantly by software
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program proprietary.  To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.

   The precise terms and conditions for copying, distribution and
modification follow.

    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  1. This License applies to any program or other work which contains a
     notice placed by the copyright holder saying it may be distributed
     under the terms of this General Public License.  The "Program",
     below, refers to any such program or work, and a "work based on the
     Program" means either the Program or any derivative work under
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     translated into another language.  (Hereinafter, translation is
     included without limitation in the term "modification".)  Each
     licensee is addressed as "you".

     Activities other than copying, distribution and modification are
     not covered by this License; they are outside its scope.  The act
     of running the Program is not restricted, and the output from the
     Program is covered only if its contents constitute a work based on
     the Program (independent of having been made by running the
     Program).  Whether that is true depends on what the Program does.

  2. You may copy and distribute verbatim copies of the Program's source
     code as you receive it, in any medium, provided that you
     conspicuously and appropriately publish on each copy an appropriate
     copyright notice and disclaimer of warranty; keep intact all the
     notices that refer to this License and to the absence of any
     warranty; and give any other recipients of the Program a copy of
     this License along with the Program.

     You may charge a fee for the physical act of transferring a copy,
     and you may at your option offer warranty protection in exchange
     for a fee.

  3. You may modify your copy or copies of the Program or any portion of
     it, thus forming a work based on the Program, and copy and
     distribute such modifications or work under the terms of Section 1
     above, provided that you also meet all of these conditions:

       a. You must cause the modified files to carry prominent notices
          stating that you changed the files and the date of any change.

       b. You must cause any work that you distribute or publish, that
          in whole or in part contains or is derived from the Program or
          any part thereof, to be licensed as a whole at no charge to
          all third parties under the terms of this License.

       c. If the modified program normally reads commands interactively
          when run, you must cause it, when started running for such
          interactive use in the most ordinary way, to print or display
          an announcement including an appropriate copyright notice and
          a notice that there is no warranty (or else, saying that you
          provide a warranty) and that users may redistribute the
          program under these conditions, and telling the user how to
          view a copy of this License.  (Exception: if the Program
          itself is interactive but does not normally print such an
          announcement, your work based on the Program is not required
          to print an announcement.)

     These requirements apply to the modified work as a whole.  If
     identifiable sections of that work are not derived from the
     Program, and can be reasonably considered independent and separate
     works in themselves, then this License, and its terms, do not apply
     to those sections when you distribute them as separate works.  But
     when you distribute the same sections as part of a whole which is a
     work based on the Program, the distribution of the whole must be on
     the terms of this License, whose permissions for other licensees
     extend to the entire whole, and thus to each and every part
     regardless of who wrote it.

     Thus, it is not the intent of this section to claim rights or
     contest your rights to work written entirely by you; rather, the
     intent is to exercise the right to control the distribution of
     derivative or collective works based on the Program.

     In addition, mere aggregation of another work not based on the
     Program with the Program (or with a work based on the Program) on a
     volume of a storage or distribution medium does not bring the other
     work under the scope of this License.

  4. You may copy and distribute the Program (or a work based on it,
     under Section 2) in object code or executable form under the terms
     of Sections 1 and 2 above provided that you also do one of the
     following:

       a. Accompany it with the complete corresponding machine-readable
          source code, which must be distributed under the terms of
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       b. Accompany it with a written offer, valid for at least three
          years, to give any third party, for a charge no more than your
          cost of physically performing source distribution, a complete
          machine-readable copy of the corresponding source code, to be
          distributed under the terms of Sections 1 and 2 above on a
          medium customarily used for software interchange; or,

       c. Accompany it with the information you received as to the offer
          to distribute corresponding source code.  (This alternative is
          allowed only for noncommercial distribution and only if you
          received the program in object code or executable form with
          such an offer, in accord with Subsection b above.)

     The source code for a work means the preferred form of the work for
     making modifications to it.  For an executable work, complete
     source code means all the source code for all modules it contains,
     plus any associated interface definition files, plus the scripts
     used to control compilation and installation of the executable.
     However, as a special exception, the source code distributed need
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     or binary form) with the major components (compiler, kernel, and so
     on) of the operating system on which the executable runs, unless
     that component itself accompanies the executable.

     If distribution of executable or object code is made by offering
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     distribution of the source code, even though third parties are not
     compelled to copy the source along with the object code.

  5. You may not copy, modify, sublicense, or distribute the Program
     except as expressly provided under this License.  Any attempt
     otherwise to copy, modify, sublicense or distribute the Program is
     void, and will automatically terminate your rights under this
     License.  However, parties who have received copies, or rights,
     from you under this License will not have their licenses terminated
     so long as such parties remain in full compliance.

  6. You are not required to accept this License, since you have not
     signed it.  However, nothing else grants you permission to modify
     or distribute the Program or its derivative works.  These actions
     are prohibited by law if you do not accept this License.
     Therefore, by modifying or distributing the Program (or any work
     based on the Program), you indicate your acceptance of this License
     to do so, and all its terms and conditions for copying,
     distributing or modifying the Program or works based on it.

  7. Each time you redistribute the Program (or any work based on the
     Program), the recipient automatically receives a license from the
     original licensor to copy, distribute or modify the Program subject
     to these terms and conditions.  You may not impose any further
     restrictions on the recipients' exercise of the rights granted
     herein.  You are not responsible for enforcing compliance by third
     parties to this License.

  8. If, as a consequence of a court judgment or allegation of patent
     infringement or for any other reason (not limited to patent
     issues), conditions are imposed on you (whether by court order,
     agreement or otherwise) that contradict the conditions of this
     License, they do not excuse you from the conditions of this
     License.  If you cannot distribute so as to satisfy simultaneously
     your obligations under this License and any other pertinent
     obligations, then as a consequence you may not distribute the
     Program at all.  For example, if a patent license would not permit
     royalty-free redistribution of the Program by all those who receive
     copies directly or indirectly through you, then the only way you
     could satisfy both it and this License would be to refrain entirely
     from distribution of the Program.

     If any portion of this section is held invalid or unenforceable
     under any particular circumstance, the balance of the section is
     intended to apply and the section as a whole is intended to apply
     in other circumstances.

     It is not the purpose of this section to induce you to infringe any
     patents or other property right claims or to contest validity of
     any such claims; this section has the sole purpose of protecting
     the integrity of the free software distribution system, which is
     implemented by public license practices.  Many people have made
     generous contributions to the wide range of software distributed
     through that system in reliance on consistent application of that
     system; it is up to the author/donor to decide if he or she is
     willing to distribute software through any other system and a
     licensee cannot impose that choice.

     This section is intended to make thoroughly clear what is believed
     to be a consequence of the rest of this License.

  9. If the distribution and/or use of the Program is restricted in
     certain countries either by patents or by copyrighted interfaces,
     the original copyright holder who places the Program under this
     License may add an explicit geographical distribution limitation
     excluding those countries, so that distribution is permitted only
     in or among countries not thus excluded.  In such case, this
     License incorporates the limitation as if written in the body of
     this License.

  10. The Free Software Foundation may publish revised and/or new
     versions of the General Public License from time to time.  Such new
     versions will be similar in spirit to the present version, but may
     differ in detail to address new problems or concerns.

     Each version is given a distinguishing version number.  If the
     Program specifies a version number of this License which applies to
     it and "any later version", you have the option of following the
     terms and conditions either of that version or of any later version
     published by the Free Software Foundation.  If the Program does not
     specify a version number of this License, you may choose any
     version ever published by the Free Software Foundation.

  11. If you wish to incorporate parts of the Program into other free
     programs whose distribution conditions are different, write to the
     author to ask for permission.  For software which is copyrighted by
     the Free Software Foundation, write to the Free Software
     Foundation; we sometimes make exceptions for this.  Our decision
     will be guided by the two goals of preserving the free status of
     all derivatives of our free software and of promoting the sharing
     and reuse of software generally.

                              NO WARRANTY

  12. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
     WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE
     LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS
     AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
     OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
     PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
     DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR
     OR CORRECTION.

  13. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
     WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY
     MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE
     LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
     INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
     INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
     DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU
     OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY
     OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN
     ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

                            ECOS EXTENSION

  14. As a special exception, if other files instantiate templates or
     use macros or inline functions from this file, or you compile this
     file and link it with other works to produce a work based on this
     file, this file does not by itself cause the resulting work to be
     covered by the GNU General Public License.  However the source code
     for this file must still be made available in accordance with
     section (3) of the GNU General Public License v2.

     This exception does not invalidate any other reasons why a work
     based on this file might be covered by the GNU General Public
     License.

END OF TERMS AND CONDITIONS
---------------------------

How to Apply These Terms to Your New Programs
=============================================

If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these
terms.

   To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least the
"copyright" line and a pointer to where the full notice is found.

     ONE LINE TO GIVE THE PROGRAM'S NAME AND AN IDEA OF WHAT IT DOES.
     Copyright (C) 19YY  NAME OF AUTHOR

     This program is free software; you can redistribute it and/or
     modify it under the terms of the GNU General Public License
     as published by the Free Software Foundation; either version 2
     of the License, or (at your option) any later version.

     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.

     You should have received a copy of the GNU General Public License along
     with this program; if not, write to the Free Software Foundation, Inc.,
     59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

   Also add information on how to contact you by electronic and paper
mail.

   If the program is interactive, make it output a short notice like
this when it starts in an interactive mode:

     Gnomovision version 69, Copyright (C) 19YY NAME OF AUTHOR
     Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
     type `show w'.  This is free software, and you are welcome
     to redistribute it under certain conditions; type `show c'
     for details.

   The hypothetical commands 'show w' and 'show c' should show the
appropriate parts of the General Public License.  Of course, the
commands you use may be called something other than 'show w' and 'show
c'; they could even be mouse-clicks or menu items--whatever suits your
program.

   You should also get your employer (if you work as a programmer) or
your school, if any, to sign a "copyright disclaimer" for the program,
if necessary.  Here is a sample; alter the names:

     Yoyodyne, Inc., hereby disclaims all copyright
     interest in the program `Gnomovision'
     (which makes passes at compilers) written
     by James Hacker.

     SIGNATURE OF TY COON, 1 April 1989
     Ty Coon, President of Vice

   This General Public License does not permit incorporating your
program into proprietary programs.  If your program is a subroutine
library, you may consider it more useful to permit linking proprietary
applications with the library.  If this is what you want to do, use the
GNU Library General Public License instead of this License.


File: libmicrohttpd.info,  Node: GNU-FDL,  Next: Concept Index,  Prev: GNU GPL with eCos Extension,  Up: Top

GNU-FDL
*******

                     Version 1.3, 3 November 2008

     Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
     <http://fsf.org/>

     Everyone is permitted to copy and distribute verbatim copies
     of this license document, but changing it is not allowed.

  0. PREAMBLE

     The purpose of this License is to make a manual, textbook, or other
     functional and useful document "free" in the sense of freedom: to
     assure everyone the effective freedom to copy and redistribute it,
     with or without modifying it, either commercially or
     noncommercially.  Secondarily, this License preserves for the
     author and publisher a way to get credit for their work, while not
     being considered responsible for modifications made by others.

     This License is a kind of "copyleft", which means that derivative
     works of the document must themselves be free in the same sense.
     It complements the GNU General Public License, which is a copyleft
     license designed for free software.

     We have designed this License in order to use it for manuals for
     free software, because free software needs free documentation: a
     free program should come with manuals providing the same freedoms
     that the software does.  But this License is not limited to
     software manuals; it can be used for any textual work, regardless
     of subject matter or whether it is published as a printed book.  We
     recommend this License principally for works whose purpose is
     instruction or reference.

  1. APPLICABILITY AND DEFINITIONS

     This License applies to any manual or other work, in any medium,
     that contains a notice placed by the copyright holder saying it can
     be distributed under the terms of this License.  Such a notice
     grants a world-wide, royalty-free license, unlimited in duration,
     to use that work under the conditions stated herein.  The
     "Document", below, refers to any such manual or work.  Any member
     of the public is a licensee, and is addressed as "you".  You accept
     the license if you copy, modify or distribute the work in a way
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     A "Modified Version" of the Document means any work containing the
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     A "Secondary Section" is a named appendix or a front-matter section
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     The "Invariant Sections" are certain Secondary Sections whose
     titles are designated, as being those of Invariant Sections, in the
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     If a section does not fit the above definition of Secondary then it
     is not allowed to be designated as Invariant.  The Document may
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     The "Cover Texts" are certain short passages of text that are
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     A "Transparent" copy of the Document means a machine-readable copy,
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     Examples of suitable formats for Transparent copies include plain
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     The "Title Page" means, for a printed book, the title page itself,
     plus such following pages as are needed to hold, legibly, the
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     works in formats which do not have any title page as such, "Title
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     work's title, preceding the beginning of the body of the text.

     The "publisher" means any person or entity that distributes copies
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     A section "Entitled XYZ" means a named subunit of the Document
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     stands for a specific section name mentioned below, such as
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     To "Preserve the Title" of such a section when you modify the
     Document means that it remains a section "Entitled XYZ" according
     to this definition.

     The Document may include Warranty Disclaimers next to the notice
     which states that this License applies to the Document.  These
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     this License, but only as regards disclaiming warranties: any other
     implication that these Warranty Disclaimers may have is void and
     has no effect on the meaning of this License.

  2. VERBATIM COPYING

     You may copy and distribute the Document in any medium, either
     commercially or noncommercially, provided that this License, the
     copyright notices, and the license notice saying this License
     applies to the Document are reproduced in all copies, and that you
     add no other conditions whatsoever to those of this License.  You
     may not use technical measures to obstruct or control the reading
     or further copying of the copies you make or distribute.  However,
     you may accept compensation in exchange for copies.  If you
     distribute a large enough number of copies you must also follow the
     conditions in section 3.

     You may also lend copies, under the same conditions stated above,
     and you may publicly display copies.

  3. COPYING IN QUANTITY

     If you publish printed copies (or copies in media that commonly
     have printed covers) of the Document, numbering more than 100, and
     the Document's license notice requires Cover Texts, you must
     enclose the copies in covers that carry, clearly and legibly, all
     these Cover Texts: Front-Cover Texts on the front cover, and
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     long as they preserve the title of the Document and satisfy these
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     If the required texts for either cover are too voluminous to fit
     legibly, you should put the first ones listed (as many as fit
     reasonably) on the actual cover, and continue the rest onto
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     If you publish or distribute Opaque copies of the Document
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     year after the last time you distribute an Opaque copy (directly or
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     It is requested, but not required, that you contact the authors of
     the Document well before redistributing any large number of copies,
     to give them a chance to provide you with an updated version of the
     Document.

  4. MODIFICATIONS

     You may copy and distribute a Modified Version of the Document
     under the conditions of sections 2 and 3 above, provided that you
     release the Modified Version under precisely this License, with the
     Modified Version filling the role of the Document, thus licensing
     distribution and modification of the Modified Version to whoever
     possesses a copy of it.  In addition, you must do these things in
     the Modified Version:

       A. Use in the Title Page (and on the covers, if any) a title
          distinct from that of the Document, and from those of previous
          versions (which should, if there were any, be listed in the
          History section of the Document).  You may use the same title
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          version gives permission.

       B. List on the Title Page, as authors, one or more persons or
          entities responsible for authorship of the modifications in
          the Modified Version, together with at least five of the
          principal authors of the Document (all of its principal
          authors, if it has fewer than five), unless they release you
          from this requirement.

       C. State on the Title page the name of the publisher of the
          Modified Version, as the publisher.

       D. Preserve all the copyright notices of the Document.

       E. Add an appropriate copyright notice for your modifications
          adjacent to the other copyright notices.

       F. Include, immediately after the copyright notices, a license
          notice giving the public permission to use the Modified
          Version under the terms of this License, in the form shown in
          the Addendum below.

       G. Preserve in that license notice the full lists of Invariant
          Sections and required Cover Texts given in the Document's
          license notice.

       H. Include an unaltered copy of this License.

       I. Preserve the section Entitled "History", Preserve its Title,
          and add to it an item stating at least the title, year, new
          authors, and publisher of the Modified Version as given on the
          Title Page.  If there is no section Entitled "History" in the
          Document, create one stating the title, year, authors, and
          publisher of the Document as given on its Title Page, then add
          an item describing the Modified Version as stated in the
          previous sentence.

       J. Preserve the network location, if any, given in the Document
          for public access to a Transparent copy of the Document, and
          likewise the network locations given in the Document for
          previous versions it was based on.  These may be placed in the
          "History" section.  You may omit a network location for a work
          that was published at least four years before the Document
          itself, or if the original publisher of the version it refers
          to gives permission.

       K. For any section Entitled "Acknowledgements" or "Dedications",
          Preserve the Title of the section, and preserve in the section
          all the substance and tone of each of the contributor
          acknowledgements and/or dedications given therein.

       L. Preserve all the Invariant Sections of the Document, unaltered
          in their text and in their titles.  Section numbers or the
          equivalent are not considered part of the section titles.

       M. Delete any section Entitled "Endorsements".  Such a section
          may not be included in the Modified Version.

       N. Do not retitle any existing section to be Entitled
          "Endorsements" or to conflict in title with any Invariant
          Section.

       O. Preserve any Warranty Disclaimers.

     If the Modified Version includes new front-matter sections or
     appendices that qualify as Secondary Sections and contain no
     material copied from the Document, you may at your option designate
     some or all of these sections as invariant.  To do this, add their
     titles to the list of Invariant Sections in the Modified Version's
     license notice.  These titles must be distinct from any other
     section titles.

     You may add a section Entitled "Endorsements", provided it contains
     nothing but endorsements of your Modified Version by various
     parties--for example, statements of peer review or that the text
     has been approved by an organization as the authoritative
     definition of a standard.

     You may add a passage of up to five words as a Front-Cover Text,
     and a passage of up to 25 words as a Back-Cover Text, to the end of
     the list of Cover Texts in the Modified Version.  Only one passage
     of Front-Cover Text and one of Back-Cover Text may be added by (or
     through arrangements made by) any one entity.  If the Document
     already includes a cover text for the same cover, previously added
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     behalf of, you may not add another; but you may replace the old
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     the old one.

     The author(s) and publisher(s) of the Document do not by this
     License give permission to use their names for publicity for or to
     assert or imply endorsement of any Modified Version.

  5. COMBINING DOCUMENTS

     You may combine the Document with other documents released under
     this License, under the terms defined in section 4 above for
     modified versions, provided that you include in the combination all
     of the Invariant Sections of all of the original documents,
     unmodified, and list them all as Invariant Sections of your
     combined work in its license notice, and that you preserve all
     their Warranty Disclaimers.

     The combined work need only contain one copy of this License, and
     multiple identical Invariant Sections may be replaced with a single
     copy.  If there are multiple Invariant Sections with the same name
     but different contents, make the title of each such section unique
     by adding at the end of it, in parentheses, the name of the
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     combined work.

     In the combination, you must combine any sections Entitled
     "History" in the various original documents, forming one section
     Entitled "History"; likewise combine any sections Entitled
     "Acknowledgements", and any sections Entitled "Dedications".  You
     must delete all sections Entitled "Endorsements."

  6. COLLECTIONS OF DOCUMENTS

     You may make a collection consisting of the Document and other
     documents released under this License, and replace the individual
     copies of this License in the various documents with a single copy
     that is included in the collection, provided that you follow the
     rules of this License for verbatim copying of each of the documents
     in all other respects.

     You may extract a single document from such a collection, and
     distribute it individually under this License, provided you insert
     a copy of this License into the extracted document, and follow this
     License in all other respects regarding verbatim copying of that
     document.

  7. AGGREGATION WITH INDEPENDENT WORKS

     A compilation of the Document or its derivatives with other
     separate and independent documents or works, in or on a volume of a
     storage or distribution medium, is called an "aggregate" if the
     copyright resulting from the compilation is not used to limit the
     legal rights of the compilation's users beyond what the individual
     works permit.  When the Document is included in an aggregate, this
     License does not apply to the other works in the aggregate which
     are not themselves derivative works of the Document.

     If the Cover Text requirement of section 3 is applicable to these
     copies of the Document, then if the Document is less than one half
     of the entire aggregate, the Document's Cover Texts may be placed
     on covers that bracket the Document within the aggregate, or the
     electronic equivalent of covers if the Document is in electronic
     form.  Otherwise they must appear on printed covers that bracket
     the whole aggregate.

  8. TRANSLATION

     Translation is considered a kind of modification, so you may
     distribute translations of the Document under the terms of section
     4.  Replacing Invariant Sections with translations requires special
     permission from their copyright holders, but you may include
     translations of some or all Invariant Sections in addition to the
     original versions of these Invariant Sections.  You may include a
     translation of this License, and all the license notices in the
     Document, and any Warranty Disclaimers, provided that you also
     include the original English version of this License and the
     original versions of those notices and disclaimers.  In case of a
     disagreement between the translation and the original version of
     this License or a notice or disclaimer, the original version will
     prevail.

     If a section in the Document is Entitled "Acknowledgements",
     "Dedications", or "History", the requirement (section 4) to
     Preserve its Title (section 1) will typically require changing the
     actual title.

  9. TERMINATION

     You may not copy, modify, sublicense, or distribute the Document
     except as expressly provided under this License.  Any attempt
     otherwise to copy, modify, sublicense, or distribute it is void,
     and will automatically terminate your rights under this License.

     However, if you cease all violation of this License, then your
     license from a particular copyright holder is reinstated (a)
     provisionally, unless and until the copyright holder explicitly and
     finally terminates your license, and (b) permanently, if the
     copyright holder fails to notify you of the violation by some
     reasonable means prior to 60 days after the cessation.

     Moreover, your license from a particular copyright holder is
     reinstated permanently if the copyright holder notifies you of the
     violation by some reasonable means, this is the first time you have
     received notice of violation of this License (for any work) from
     that copyright holder, and you cure the violation prior to 30 days
     after your receipt of the notice.

     Termination of your rights under this section does not terminate
     the licenses of parties who have received copies or rights from you
     under this License.  If your rights have been terminated and not
     permanently reinstated, receipt of a copy of some or all of the
     same material does not give you any rights to use it.

  10. FUTURE REVISIONS OF THIS LICENSE

     The Free Software Foundation may publish new, revised versions of
     the GNU Free Documentation License from time to time.  Such new
     versions will be similar in spirit to the present version, but may
     differ in detail to address new problems or concerns.  See
     <http://www.gnu.org/copyleft/>.

     Each version of the License is given a distinguishing version
     number.  If the Document specifies that a particular numbered
     version of this License "or any later version" applies to it, you
     have the option of following the terms and conditions either of
     that specified version or of any later version that has been
     published (not as a draft) by the Free Software Foundation.  If the
     Document does not specify a version number of this License, you may
     choose any version ever published (not as a draft) by the Free
     Software Foundation.  If the Document specifies that a proxy can
     decide which future versions of this License can be used, that
     proxy's public statement of acceptance of a version permanently
     authorizes you to choose that version for the Document.

  11. RELICENSING

     "Massive Multiauthor Collaboration Site" (or "MMC Site") means any
     World Wide Web server that publishes copyrightable works and also
     provides prominent facilities for anybody to edit those works.  A
     public wiki that anybody can edit is an example of such a server.
     A "Massive Multiauthor Collaboration" (or "MMC") contained in the
     site means any set of copyrightable works thus published on the MMC
     site.

     "CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0
     license published by Creative Commons Corporation, a not-for-profit
     corporation with a principal place of business in San Francisco,
     California, as well as future copyleft versions of that license
     published by that same organization.

     "Incorporate" means to publish or republish a Document, in whole or
     in part, as part of another Document.

     An MMC is "eligible for relicensing" if it is licensed under this
     License, and if all works that were first published under this
     License somewhere other than this MMC, and subsequently
     incorporated in whole or in part into the MMC, (1) had no cover
     texts or invariant sections, and (2) were thus incorporated prior
     to November 1, 2008.

     The operator of an MMC Site may republish an MMC contained in the
     site under CC-BY-SA on the same site at any time before August 1,
     2009, provided the MMC is eligible for relicensing.

ADDENDUM: How to use this License for your documents
====================================================

To use this License in a document you have written, include a copy of
the License in the document and put the following copyright and license
notices just after the title page:

       Copyright (C)  YEAR  YOUR NAME.
       Permission is granted to copy, distribute and/or modify this document
       under the terms of the GNU Free Documentation License, Version 1.3
       or any later version published by the Free Software Foundation;
       with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
       Texts.  A copy of the license is included in the section entitled ``GNU
       Free Documentation License''.

   If you have Invariant Sections, Front-Cover Texts and Back-Cover
Texts, replace the "with...Texts."  line with this:

         with the Invariant Sections being LIST THEIR TITLES, with
         the Front-Cover Texts being LIST, and with the Back-Cover Texts
         being LIST.

   If you have Invariant Sections without Cover Texts, or some other
combination of the three, merge those two alternatives to suit the
situation.

   If your document contains nontrivial examples of program code, we
recommend releasing these examples in parallel under your choice of free
software license, such as the GNU General Public License, to permit
their use in free software.


File: libmicrohttpd.info,  Node: Concept Index,  Next: Function and Data Index,  Prev: GNU-FDL,  Up: Top

Concept Index
*************

[index]
* Menu:

* ARM:                                   microhttpd-intro.    (line 249)
* bind, restricting bind:                microhttpd-const.    (line 226)
* bind, restricting bind <1>:            microhttpd-const.    (line 445)
* cipher:                                microhttpd-const.    (line 299)
* clock:                                 microhttpd-const.    (line  88)
* compilation:                           microhttpd-intro.    (line 107)
* connection, limiting number of connections: microhttpd-const.
                                                              (line 150)
* connection, limiting number of connections <1>: microhttpd-info daemon.
                                                              (line  60)
* cookie:                                microhttpd-const.    (line 481)
* cortex m3:                             microhttpd-intro.    (line 249)
* date:                                  microhttpd-const.    (line  88)
* debugging:                             microhttpd-const.    (line  24)
* debugging <1>:                         microhttpd-const.    (line 237)
* DH:                                    microhttpd-const.    (line 437)
* digest auth:                           microhttpd-const.    (line 322)
* digest auth <1>:                       microhttpd-const.    (line 333)
* eCos, GNU General Public License with eCos Extension: GNU GPL with eCos Extension.
                                                              (line   6)
* embedded systems:                      microhttpd-intro.    (line 107)
* embedded systems <1>:                  microhttpd-intro.    (line 249)
* embedded systems <2>:                  microhttpd-const.    (line  88)
* embedded systems <3>:                  microhttpd-const.    (line  95)
* embedded systems <4>:                  microhttpd-const.    (line 421)
* epoll:                                 microhttpd-intro.    (line  55)
* epoll <1>:                             microhttpd-const.    (line  76)
* epoll <2>:                             microhttpd-info daemon.
                                                              (line  49)
* escaping:                              microhttpd-const.    (line 404)
* FD_SETSIZE:                            microhttpd-const.    (line  68)
* FD_SETSIZE <1>:                        microhttpd-const.    (line  76)
* foreign-function interface:            microhttpd-const.    (line 382)
* GPL, GNU General Public License:       GNU GPL with eCos Extension.
                                                              (line   6)
* IAR:                                   microhttpd-intro.    (line 249)
* internationalization:                  microhttpd-const.    (line 404)
* IPv6:                                  microhttpd-const.    (line  43)
* IPv6 <1>:                              microhttpd-const.    (line  53)
* license:                               GNU-LGPL.            (line   6)
* license <1>:                           GNU GPL with eCos Extension.
                                                              (line   6)
* license <2>:                           GNU-FDL.             (line   6)
* listen:                                microhttpd-const.    (line  95)
* listen <1>:                            microhttpd-const.    (line 121)
* listen <2>:                            microhttpd-const.    (line 427)
* listen <3>:                            microhttpd-info daemon.
                                                              (line  43)
* logging:                               microhttpd-const.    (line 237)
* logging <1>:                           microhttpd-const.    (line 363)
* long long:                             microhttpd-intro.    (line 249)
* memory:                                microhttpd-const.    (line 142)
* memory, limiting memory utilization:   microhttpd-const.    (line 134)
* MHD_LONG_LONG:                         microhttpd-intro.    (line 249)
* microhttpd.h:                          microhttpd-intro.    (line 189)
* options:                               microhttpd-const.    (line 382)
* performance:                           microhttpd-intro.    (line  77)
* performance <1>:                       microhttpd-const.    (line 374)
* poll:                                  microhttpd-intro.    (line  55)
* poll <1>:                              microhttpd-const.    (line  68)
* poll <2>:                              microhttpd-init.     (line  74)
* portability:                           microhttpd-intro.    (line 107)
* portability <1>:                       microhttpd-intro.    (line 189)
* POST method:                           microhttpd-const.    (line 485)
* POST method <1>:                       microhttpd-struct.   (line  19)
* POST method <2>:                       microhttpd-cb.       (line  48)
* POST method <3>:                       microhttpd-post.     (line   6)
* POST method <4>:                       microhttpd-post api. (line   6)
* proxy:                                 microhttpd-const.    (line  95)
* pthread:                               microhttpd-const.    (line 421)
* PUT method:                            microhttpd-cb.       (line  48)
* query string:                          microhttpd-const.    (line 237)
* quiesce:                               microhttpd-const.    (line 102)
* quiesce <1>:                           microhttpd-init.     (line  51)
* random:                                microhttpd-const.    (line 322)
* replay attack:                         microhttpd-const.    (line 333)
* reusing listening address:             microhttpd-const.    (line 445)
* select:                                microhttpd-intro.    (line  55)
* select <1>:                            microhttpd-const.    (line  68)
* select <2>:                            microhttpd-const.    (line  76)
* select <3>:                            microhttpd-init.     (line  74)
* select <4>:                            microhttpd-init.     (line  89)
* signals:                               microhttpd-intro.    (line 210)
* SNI:                                   microhttpd-const.    (line 307)
* SSL:                                   microhttpd-const.    (line  32)
* SSL <1>:                               microhttpd-const.    (line 260)
* SSL <2>:                               microhttpd-const.    (line 266)
* SSL <3>:                               microhttpd-const.    (line 276)
* SSL <4>:                               microhttpd-const.    (line 282)
* SSL <5>:                               microhttpd-const.    (line 294)
* SSL <6>:                               microhttpd-const.    (line 299)
* SSL <7>:                               microhttpd-const.    (line 307)
* SSL <8>:                               microhttpd-const.    (line 437)
* stack:                                 microhttpd-const.    (line 421)
* systemd:                               microhttpd-const.    (line 356)
* thread:                                microhttpd-const.    (line 421)
* timeout:                               microhttpd-const.    (line 178)
* timeout <1>:                           microhttpd-inspect.  (line  24)
* timeout <2>:                           microhttpd-option conn.
                                                              (line   6)
* TLS:                                   microhttpd-const.    (line  32)
* TLS <1>:                               microhttpd-const.    (line 260)
* TLS <2>:                               microhttpd-const.    (line 266)
* TLS <3>:                               microhttpd-const.    (line 276)
* TLS <4>:                               microhttpd-const.    (line 282)
* TLS <5>:                               microhttpd-const.    (line 294)
* TLS <6>:                               microhttpd-const.    (line 299)
* TLS <7>:                               microhttpd-const.    (line 307)
* TLS <8>:                               microhttpd-const.    (line 437)


File: libmicrohttpd.info,  Node: Function and Data Index,  Next: Type Index,  Prev: Concept Index,  Up: Top

Function and Data Index
***********************

[index]
* Menu:

* *MHD_AcceptPolicyCallback:             microhttpd-cb.       (line   6)
* *MHD_AccessHandlerCallback:            microhttpd-cb.       (line  19)
* *MHD_ContentReaderCallback:            microhttpd-cb.       (line 138)
* *MHD_ContentReaderFreeCallback:        microhttpd-cb.       (line 185)
* *MHD_KeyValueIterator:                 microhttpd-cb.       (line 116)
* *MHD_PostDataIterator:                 microhttpd-cb.       (line 190)
* *MHD_RequestCompletedCallback:         microhttpd-cb.       (line  96)
* MHD_add_connection:                    microhttpd-init.     (line 115)
* MHD_add_response_footer:               microhttpd-response headers.
                                                              (line  18)
* MHD_add_response_header:               microhttpd-response headers.
                                                              (line   6)
* MHD_basic_auth_get_username_password:  microhttpd-dauth basic.
                                                              (line   6)
* MHD_create_post_processor:             microhttpd-post api. (line   6)
* MHD_create_response_from_buffer:       microhttpd-response create.
                                                              (line  92)
* MHD_create_response_from_callback:     microhttpd-response create.
                                                              (line   6)
* MHD_create_response_from_data:         microhttpd-response create.
                                                              (line 113)
* MHD_create_response_from_fd:           microhttpd-response create.
                                                              (line  32)
* MHD_create_response_from_fd_at_offset: microhttpd-response create.
                                                              (line  50)
* MHD_del_response_header:               microhttpd-response headers.
                                                              (line  34)
* MHD_destroy_post_processor:            microhttpd-post api. (line  52)
* MHD_destroy_response:                  microhttpd-response enqueue.
                                                              (line  28)
* MHD_digest_auth_check:                 microhttpd-dauth digest.
                                                              (line  13)
* MHD_digest_auth_get_username:          microhttpd-dauth digest.
                                                              (line   6)
* MHD_get_connection_info:               microhttpd-info conn.
                                                              (line   6)
* MHD_get_connection_values:             microhttpd-requests. (line   6)
* MHD_get_daemon_info:                   microhttpd-info daemon.
                                                              (line   6)
* MHD_get_fdset:                         microhttpd-inspect.  (line   6)
* MHD_get_response_header:               microhttpd-response inspect.
                                                              (line  18)
* MHD_get_response_headers:              microhttpd-response inspect.
                                                              (line   6)
* MHD_get_timeout:                       microhttpd-inspect.  (line  22)
* MHD_http_unescape:                     microhttpd-util unescape.
                                                              (line   6)
* MHD_is_feature_supported:              microhttpd-util feature.
                                                              (line  75)
* MHD_lookup_connection_value:           microhttpd-requests. (line  56)
* MHD_post_process:                      microhttpd-post api. (line  33)
* MHD_queue_auth_fail_response:          microhttpd-dauth digest.
                                                              (line  35)
* MHD_queue_basic_auth_fail_response:    microhttpd-dauth basic.
                                                              (line  17)
* MHD_queue_response:                    microhttpd-response enqueue.
                                                              (line   6)
* MHD_quiesce_daemon:                    microhttpd-init.     (line  50)
* MHD_resume_connection:                 microhttpd-flow.     (line  49)
* MHD_run:                               microhttpd-init.     (line  70)
* MHD_run_from_select:                   microhttpd-init.     (line  86)
* MHD_set_connection_option:             microhttpd-option conn.
                                                              (line   6)
* MHD_set_connection_value:              microhttpd-requests. (line  33)
* MHD_set_panic_func:                    microhttpd-init.     (line   6)
* MHD_set_response_options:              microhttpd-response options.
                                                              (line   6)
* MHD_start_daemon:                      microhttpd-init.     (line  18)
* MHD_stop_daemon:                       microhttpd-init.     (line  67)
* MHD_suspend_connection:                microhttpd-flow.     (line  20)


File: libmicrohttpd.info,  Node: Type Index,  Prev: Function and Data Index,  Up: Top

Type Index
**********

[index]
* Menu:

* MHD_Connection:                        microhttpd-struct.   (line   9)
* MHD_ConnectionInfo:                    microhttpd-struct.   (line  21)
* MHD_ConnectionInfoType:                microhttpd-info conn.
                                                              (line  25)
* MHD_CONNECTION_OPTION:                 microhttpd-option conn.
                                                              (line  22)
* MHD_Daemon:                            microhttpd-struct.   (line   6)
* MHD_DaemonInfo:                        microhttpd-struct.   (line  24)
* MHD_DaemonInfoType:                    microhttpd-info daemon.
                                                              (line  25)
* MHD_FEATURE:                           microhttpd-util feature.
                                                              (line   6)
* MHD_FLAG:                              microhttpd-const.    (line   6)
* MHD_OPTION:                            microhttpd-const.    (line 125)
* MHD_OptionItem:                        microhttpd-const.    (line 457)
* MHD_PostProcessor:                     microhttpd-struct.   (line  18)
* MHD_RequestTerminationCode:            microhttpd-const.    (line 498)
* MHD_Response:                          microhttpd-struct.   (line  15)
* MHD_ResponseFlags:                     microhttpd-const.    (line 538)
* MHD_ResponseMemoryMode:                microhttpd-const.    (line 516)
* MHD_ResponseOptions:                   microhttpd-const.    (line 550)
* MHD_ValueKind:                         microhttpd-const.    (line 470)



Tag Table:
Node: Top813
Node: microhttpd-intro3014
Ref: fig:performance7063
Ref: tbl:supported8008
Node: microhttpd-const15281
Node: microhttpd-struct42798
Node: microhttpd-cb43578
Node: microhttpd-init52920
Node: microhttpd-inspect58674
Node: microhttpd-requests60611
Node: microhttpd-responses64095
Node: microhttpd-response enqueue65207
Ref: microhttpd-response enqueue-Footnote-167474
Node: microhttpd-response create67693
Node: microhttpd-response headers73726
Node: microhttpd-response options75553
Node: microhttpd-response inspect76408
Node: microhttpd-flow77581
Node: microhttpd-dauth80172
Node: microhttpd-dauth basic81723
Node: microhttpd-dauth digest82915
Node: microhttpd-post87563
Node: microhttpd-post api90508
Node: microhttpd-info93092
Node: microhttpd-info daemon93514
Node: microhttpd-info conn96919
Node: microhttpd-option conn100636
Node: microhttpd-util101700
Node: microhttpd-util feature101971
Node: microhttpd-util unescape105412
Node: GNU-LGPL106052
Node: GNU GPL with eCos Extension134156
Node: GNU-FDL154024
Node: Concept Index179110
Node: Function and Data Index187200
Node: Type Index192372

End Tag Table