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);

DESCRIPTION

       Set  the  long  gohead  parameter  to  1L to make libcurl continue to send authentication (user+password)
       credentials or explicitly set cookie headers when following locations, even when the host  changes.  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: or Cookie: headers on requests done to other hosts than the one used for the initial URL.
       Another host means that one or more of hostname, protocol scheme or port number changed.

       By  default,  libcurl only sends Authentication: or explicitly set Cookie: headers to the initial host 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 makes curl trust the server and
       sends possibly sensitive credentials to any host the server points to, possibly again and  again  as  the
       following hosts can keep redirecting to new hosts.

       Due to the way HTTP works, almost any header can be made to contain data a client may not want to pass on
       to other servers than the initially intended host and for all other headers than the two mentioned above,
       there is no protection from this happening when libcurl is told to follow redirects.

DEFAULT

       0

PROTOCOLS

       This functionality affects http only

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

       Added in curl 7.10.4

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

       CURLINFO_REDIRECT_COUNT(3),                CURLOPT_FOLLOWLOCATION(3),               CURLOPT_MAXREDIRS(3),
       CURLOPT_REDIR_PROTOCOLS_STR(3), CURLOPT_USERPWD(3)

libcurl                                            2025-03-05                       CURLOPT_UNRESTRICTED_AUTH(3)