CURLINFO_HTTPAUTH_AVAIL

Section: curl_easy_getinfo options (3)
Updated: November 04, 2020
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NAME

CURLINFO_HTTPAUTH_AVAIL - get available HTTP authentication methods

SYNOPSIS

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(S)

EXAMPLE

CURL *curl = curl_easy_init();
if(curl) {
  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 RFC2617 in 7.10.8 Added RFC7616 in 7.57.0

RETURN VALUE

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