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deps/curl/docs/libcurl/opts/CURLINFO_PROXYAUTH_AVAIL.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLINFO_PROXYAUTH_AVAIL
+Section: 3
+Source: libcurl
+See-also:
+  - CURLINFO_HTTPAUTH_AVAIL (3)
+  - curl_easy_getinfo (3)
+  - curl_easy_setopt (3)
+---
+
+# NAME
+
+CURLINFO_PROXYAUTH_AVAIL - get available HTTP proxy authentication methods
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PROXYAUTH_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_PROXYAUTH(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");
+    curl_easy_setopt(curl, CURLOPT_PROXY, "http://127.0.0.1:80");
+
+    res = curl_easy_perform(curl);
+
+    if(!res) {
+      /* extract the available proxy authentication types */
+      long auth;
+      res = curl_easy_getinfo(curl, CURLINFO_PROXYAUTH_AVAIL, &auth);
+      if(!res) {
+        if(!auth)
+          printf("No proxy auth available, perhaps no 407?\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.