CURLINFO_PROXYAUTH_USED(3) Library Functions Manual CURLINFO_PROXYAUTH_USED(3)
NAME
CURLINFO_PROXYAUTH_USED - get used HTTP proxy authentication method
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PROXYAUTH_USED, long *authp);
DESCRIPTION
Pass a pointer to a long to receive a bitmask indicating the authentica-
tion method that was used in the previous request done over an HTTP
proxy. The meaning of the possible bits is explained in the CUR-
LOPT_HTTPAUTH(3) option for curl_easy_setopt(3).
The returned value has zero or one bit set.
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://proxy.example.com");
curl_easy_setopt(curl, CURLOPT_PROXYAUTH,
CURLAUTH_BASIC | CURLAUTH_DIGEST);
curl_easy_setopt(curl, CURLOPT_PROXYUSERNAME, "shrek");
curl_easy_setopt(curl, CURLOPT_PROXYPASSWORD, "swamp");
res = curl_easy_perform(curl);
if(!res) {
long auth;
res = curl_easy_getinfo(curl, CURLINFO_PROXYAUTH_USED, &auth);
if(!res) {
if(!auth)
printf("No auth used\n");
else {
if(auth == CURLAUTH_DIGEST)
printf("Used Digest proxy authentication\n");
else
printf("Used Basic proxy authentication\n");
}
}
}
curl_easy_cleanup(curl);
}
}
AVAILABILITY
Added in curl 8.12.0
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_USED(3), CURLINFO_PROXYAUTH_AVAIL(3), CUR-
LOPT_HTTPAUTH(3)
libcurl 2026-07-12 CURLINFO_PROXYAUTH_USED(3)
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