1---
2c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
3SPDX-License-Identifier: curl
4Title: CURLINFO_CONDITION_UNMET
5Section: 3
6Source: libcurl
7See-also:
8  - CURLOPT_TIMECONDITION (3)
9  - CURLOPT_TIMEVALUE (3)
10  - curl_easy_getinfo (3)
11  - curl_easy_setopt (3)
12---
13
14# NAME
15
16CURLINFO_CONDITION_UNMET - get info on unmet time conditional or 304 HTTP response.
17
18# SYNOPSIS
19
20~~~c
21#include <curl/curl.h>
22
23CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CONDITION_UNMET,
24                           long *unmet);
25~~~
26
27# DESCRIPTION
28
29Pass a pointer to a long to receive the number 1 if the condition provided in
30the previous request did not match (see CURLOPT_TIMECONDITION(3)). Alas,
31if this returns a 1 you know that the reason you did not get data in return is
32because it did not fulfill the condition. The long this argument points to
33gets a zero stored if the condition instead was met. This can also return 1 if
34the server responded with a 304 HTTP status code, for example after sending a
35custom "If-Match-*" header.
36
37# PROTOCOLS
38
39HTTP and some
40
41# EXAMPLE
42
43~~~c
44int main(void)
45{
46  CURL *curl = curl_easy_init();
47  if(curl) {
48    CURLcode res;
49
50    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
51
52    /* January 1, 2020 is 1577833200 */
53    curl_easy_setopt(curl, CURLOPT_TIMEVALUE, 1577833200L);
54
55    /* If-Modified-Since the above time stamp */
56    curl_easy_setopt(curl, CURLOPT_TIMECONDITION,
57                     (long)CURL_TIMECOND_IFMODSINCE);
58
59    /* Perform the request */
60    res = curl_easy_perform(curl);
61
62    if(!res) {
63      /* check the time condition */
64      long unmet;
65      res = curl_easy_getinfo(curl, CURLINFO_CONDITION_UNMET, &unmet);
66      if(!res) {
67        printf("The time condition was %sfulfilled\n", unmet?"NOT":"");
68      }
69    }
70  }
71}
72~~~
73
74# AVAILABILITY
75
76Added in 7.19.4
77
78# RETURN VALUE
79
80Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
81