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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
/* <DESC>
* Extract headers post transfer with the header API
* </DESC>
*/
#include <stdio.h>
#include <curl/curl.h>
static size_t write_cb(char *data, size_t n, size_t l, void *userp)
{
/* take care of the data here, ignored in this example */
(void)data;
(void)userp;
return n*l;
}
int main(void)
{
CURL *curl;
curl = curl_easy_init();
if(curl) {
CURLcode res;
struct curl_header *header;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
/* example.com is redirected, so we tell libcurl to follow redirection */
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
/* this example just ignores the content */
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_cb);
/* Perform the request, res will get the return code */
res = curl_easy_perform(curl);
/* Check for errors */
if(res != CURLE_OK)
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
if(CURLHE_OK == curl_easy_header(curl, "Content-Type", 0, CURLH_HEADER,
-1, &header))
printf("Got content-type: %s\n", header->value);
printf("All server headers:\n");
{
struct curl_header *h;
struct curl_header *prev = NULL;
do {
h = curl_easy_nextheader(curl, CURLH_HEADER, -1, prev);
if(h)
printf(" %s: %s (%u)\n", h->name, h->value, (int)h->amount);
prev = h;
} while(h);
}
/* always cleanup */
curl_easy_cleanup(curl);
}
return 0;
}
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