-sub _chain_params ($) {
-# =item C<< $authreq->_chain_params() >>
-#
-# Returns a hash of the "relevant" parameters to this request, in a form
-# 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<< '' >>.
-