'Extracts necessary query params from request.
:param req: the WSGI Request object
:returns: dict of parameters that can be used by registry client'

def _get_query_params(self, req):

    params = {'filters': self._get_filters(req)}
    for PARAM in SUPPORTED_PARAMS:
        if (PARAM in req.params):
            params[PARAM] = req.params.get(PARAM)
    params['member_status'] = 'all'
    return params
