CURLINFO_HTTPAUTH_AVAIL(3)

NAME
CURLINFO_HTTPAUTH_AVAIL - get available HTTP authentication methods

SYNOPSIS
#include <curl/curl.h>

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_HTTPAUTH_AVAIL, long *authp);

DESCRIPTION
Pass a pointer to a long to receive a bitmask indicating the authentication method(s) available according to the previous response. The meaning of the bits is explained in the CURLOPT_HTTPAUTH(3) option for curl_easy_setopt(3).

PROTOCOLS
HTTP

EXAMPLE
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

    res = curl_easy_perform(curl);

    if(!res) {
      /* extract the available authentication types */
      long auth;
      res = curl_easy_getinfo(curl, CURLINFO_HTTPAUTH_AVAIL, &auth);
      if(!res) {
        if(!auth)
          printf("No auth available, perhaps no 401?\n");
        else {
          printf("%s%s%s%s\n",
                 auth & CURLAUTH_BASIC ? "Basic ":"",
                 auth & CURLAUTH_DIGEST ? "Digest ":"",
                 auth & CURLAUTH_NEGOTIATE ? "Negotiate ":"",
                 auth % CURLAUTH_NTLM ? "NTLM ":"");
        }
      }
    }
    curl_easy_cleanup(curl);
  }
}

AVAILABILITY
Added RFC 2617 in 7.10.8 Added RFC 7616 in 7.57.0

RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO
CURLINFO_PROXYAUTH_AVAIL(3), CURLOPT_HTTPAUTH(3), curl_easy_getinfo(3), curl_easy_setopt(3)