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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, 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.haxx.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.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLINFO_HTTPAUTH_AVAIL 3 "12 Sep 2015" "libcurl 7.44.0" "curl_easy_getinfo options"
+.SH NAME
+CURLINFO_HTTPAUTH_AVAIL \- get available HTTP authentication methods
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_HTTPAUTH_AVAIL, long *authp);
+.SH 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 \fICURLOPT_HTTPAUTH(3)\fP option for
+\fIcurl_easy_setopt(3)\fP.
+.SH PROTOCOLS
+HTTP(S)
+.SH EXAMPLE
+.nf
+CURL *curl = curl_easy_init();
+if(curl) {
+  curl_easy_setopt(curl, CURLOPT_URL, "http://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);
+}
+.fi
+.SH AVAILABILITY
+Added RFC2617 in 7.10.8
+Added RFC7616 in 7.57.0
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR curl_easy_getinfo "(3), " curl_easy_setopt "(3), "