/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) Daniel Stenberg, , 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 * ***************************************************************************/ /* * Extract headers post transfer with the header API * */ #include #include 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 gets 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; }