curl-w32/docs/libcurl/opts/CURLINFO_HTTPAUTH_AVAIL.md

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---
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
SPDX-License-Identifier: curl
Title: CURLINFO_HTTPAUTH_AVAIL
Section: 3
Source: libcurl
See-also:
- CURLINFO_PROXYAUTH_AVAIL (3)
- CURLOPT_HTTPAUTH (3)
- curl_easy_getinfo (3)
- curl_easy_setopt (3)
---
# NAME
CURLINFO_HTTPAUTH_AVAIL - get available HTTP authentication methods
# SYNOPSIS
~~~c
#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(S)
# EXAMPLE
~~~c
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.