$ua->redirect_ok( $prospective_request, $response )

    This method is called by request() before it tries to follow a redirection to the request in $response. This should return a TRUE value if this redirection is permissible. The $prospective_request will be the request to be sent if this method returns TRUE.

    The base implementation will return FALSE unless the method is in the object's requests_redirectable list, FALSE if the proposed redirection is to a "file://..." URL, and TRUE otherwise.