CURLOPT_PROXYAUTH(3) Library Functions Manual CURLOPT_PROXYAUTH(3)
NAME
CURLOPT_PROXYAUTH - HTTP proxy authentication methods
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXYAUTH, long bitmask);
DESCRIPTION
Pass a long as parameter, which is set to a bitmask, to tell libcurl
which HTTP authentication method(s) you want it to use for your proxy
authentication. If more than one bit is set, libcurl first queries the
site to see what authentication methods it supports and then it picks
the best one you allow it to use. For some methods, this induces an
extra network round-trip. Set the actual name and password with the
CURLOPT_PROXYUSERPWD(3) option.
The bitmask can be constructed by the bits listed and described in the
CURLOPT_HTTPAUTH(3) man page.
DEFAULT
CURLAUTH_BASIC
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode result;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
/* use this proxy */
curl_easy_setopt(curl, CURLOPT_PROXY, "http://local.example.com:1080");
/* allow whatever auth the proxy speaks */
curl_easy_setopt(curl, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
/* set the proxy credentials */
curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, "james:007");
result = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
HISTORY
CURLAUTH_* macros became long types in 7.26.0, prior to this version a
long cast was necessary when passed to =.
AVAILABILITY
Added in curl 7.10.7
RETURN VALUE
curl_easy_setopt(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
CURLOPT_HTTPAUTH(3), CURLOPT_PROXY(3), CURLOPT_PROXYPORT(3),
CURLOPT_PROXYTYPE(3), CURLOPT_PROXYUSERPWD(3)
libcurl 2026-03-23 CURLOPT_PROXYAUTH(3)
curl 8.19.0 - Generated Mon Mar 30 07:52:50 CDT 2026