CURLINFO_PROXYAUTH_AVAIL(3) Introduction to Library Functions

NAME

CURLINFO_PROXYAUTH_AVAIL - HTTP proxy authentication methods

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
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

This functionality affects http only

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode result;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
curl_easy_setopt(curl, CURLOPT_PROXY, "http://127.0.0.1:80");

result = curl_easy_perform(curl);

if(!result) {
/* extract the available proxy authentication types */
long auth;
result = curl_easy_getinfo(curl, CURLINFO_PROXYAUTH_AVAIL, &auth);
if(!result) {
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 2026-01-08 CURLINFO_PROXYAUTH_AVAIL(3)