libcurl-check-response.c

/*
   Compile using
   gcc libcurl-check-response.c -lcurl -o libcurl-check-response
*/

#include <curl/curl.h>

int main(int argc, char *argv[])
{
  CURLcode ret;
  CURL *hnd;
  FILE *devnull = fopen("/dev/null", "w");

  hnd = curl_easy_init();
  curl_easy_setopt(hnd, CURLOPT_URL, "https://google.com");
  curl_easy_setopt(hnd, CURLOPT_NOPROGRESS, 1L);
  curl_easy_setopt(hnd, CURLOPT_NOBODY, 1L);
  curl_easy_setopt(hnd, CURLOPT_HEADER, 1L);
  curl_easy_setopt(hnd, CURLOPT_FOLLOWLOCATION, 1L);
  curl_easy_setopt(hnd, CURLOPT_USERAGENT, "curl/7.47.0");
  curl_easy_setopt(hnd, CURLOPT_MAXREDIRS, 50L);
  curl_easy_setopt(hnd, CURLOPT_FILETIME, 1L);
  curl_easy_setopt(hnd, CURLOPT_TCP_KEEPALIVE, 1L);
  curl_easy_setopt(hnd, CURLOPT_WRITEDATA, devnull);

  ret = curl_easy_perform(hnd);
  
  if(ret == CURLE_OK) {
    long response_code;
    curl_easy_getinfo(hnd, CURLINFO_RESPONSE_CODE, &response_code);
    printf("%ld\n", response_code);
  }

  curl_easy_cleanup(hnd);
  hnd = NULL;
  fclose(devnull);

  return (int)ret;
}