CURLINFO_PROXYAUTH_AVAIL(3) - Man pages

CURLINFO_PROXYAUTH_AVAIL(3) Library Functions ManualCURLINFO_PROXYAUTH_AVAIL(3)

NAME
       CURLINFO_PROXYAUTH_AVAIL - get available HTTP proxy authentication meth-
       ods

SYNOPSIS
       #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 authentica-
       tion 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
       This functionality affects http only

EXAMPLE
       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 in curl 7.10.8

RETURN VALUE
       curl_easy_getinfo(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error  occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLINFO_HTTPAUTH_AVAIL(3), curl_easy_getinfo(3), curl_easy_setopt(3)

libcurl                            2026-07-12       CURLINFO_PROXYAUTH_AVAIL(3)

Generated by dwww version 1.16 on Sat Oct 3 05:20:34 CEST 2026.