CURLOPT_UNRESTRICTED_AUTH - send credentials to other hosts too

NAME SYNOPSIS DESCRIPTION DEFAULT PROTOCOLS EXAMPLE AVAILABILITY RETURN VALUE SEE ALSO

NAME

CURLOPT_UNRESTRICTED_AUTH − send credentials to other hosts too

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UNRESTRICTED_AUTH,
long goahead);

Set the long gohead parameter to 1L to make libcurl continue to send authentication (user+password) credentials when following locations, even when hostname changed. This option is meaningful only when setting CURLOPT_FOLLOWLOCATION(3).

Further, when this option is not used or set to 0L, libcurl does not send custom nor internally generated Authentication: headers on requests done to other hosts than the one used for the initial URL.

By default, libcurl only sends credentials and Authentication headers to the initial host name as given in the original URL, to avoid leaking username + password to other sites.

This option should be used with caution: when curl follows redirects it blindly fetches the next URL as instructed by the server. Setting CURLOPT_UNRESTRICTED_AUTH(3) to 1L therefore also makes curl trust the server and sends possibly sensitive credentials to any host the server points out. And then maybe again and again as the following hosts can keep redirecting to new hosts.

DEFAULT

PROTOCOLS

HTTP

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl, CURLOPT_UNRESTRICTED_AUTH, 1L);
curl_easy_perform(curl);
}
}

AVAILABILITY

Along with HTTP

RETURN VALUE

Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.