cookie in the forms generated by C<check_ok>. You may also set it
yourself (and indeed you must do so if you use C<check_divert>).
-=item C<< $authreq->_chain_params() >>
+=item C<< $authreq->chain_params() >>
Returns a hash of the "relevant" parameters to this request, in a form
suitable for C<url_with_query_params>. This is all of the query