=item C<< $authreq->chain_params() >>
Returns a hash of the "relevant" parameters to this request, in a form
-used by XXX. This is all of the query parameters which are not
-related to CGI::Auth::Flexible. The PATH_INFO from the request is
-returned as the parameter C<< '' >>.
+used by C<url_with_query_params>. This is all of the query parameters
+which are not related to CGI::Auth::Flexible. The PATH_INFO from the
+request is returned as the parameter C<< '' >>.
xxx why use this function