1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at https://curl.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 * SPDX-License-Identifier: curl 22 * 23 ***************************************************************************/ 24/* <DESC> 25 * Extract headers post transfer with the header API 26 * </DESC> 27 */ 28#include <stdio.h> 29#include <curl/curl.h> 30 31static size_t write_cb(char *data, size_t n, size_t l, void *userp) 32{ 33 /* take care of the data here, ignored in this example */ 34 (void)data; 35 (void)userp; 36 return n*l; 37} 38 39int main(void) 40{ 41 CURL *curl; 42 43 curl = curl_easy_init(); 44 if(curl) { 45 CURLcode res; 46 struct curl_header *header; 47 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); 48 /* example.com is redirected, so we tell libcurl to follow redirection */ 49 curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); 50 51 /* this example just ignores the content */ 52 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_cb); 53 54 /* Perform the request, res will get the return code */ 55 res = curl_easy_perform(curl); 56 /* Check for errors */ 57 if(res != CURLE_OK) 58 fprintf(stderr, "curl_easy_perform() failed: %s\n", 59 curl_easy_strerror(res)); 60 61 if(CURLHE_OK == curl_easy_header(curl, "Content-Type", 0, CURLH_HEADER, 62 -1, &header)) 63 printf("Got content-type: %s\n", header->value); 64 65 printf("All server headers:\n"); 66 { 67 struct curl_header *h; 68 struct curl_header *prev = NULL; 69 do { 70 h = curl_easy_nextheader(curl, CURLH_HEADER, -1, prev); 71 if(h) 72 printf(" %s: %s (%u)\n", h->name, h->value, (int)h->amount); 73 prev = h; 74 } while(h); 75 76 } 77 /* always cleanup */ 78 curl_easy_cleanup(curl); 79 } 80 return 0; 81} 82