code: def handle_authn_request(self, context, binding_in):
          
          target_entity_id = context.target_entity_id_from_path()
          target_entity_id = urlsafe_b64decode(target_entity_id).decode()
          context.decorate(Context.KEY_TARGET_ENTITYID, target_entity_id)
  
          idp = self._load_idp_dynamic_endpoints(context)
          return self._handle_authn_request(context, binding_in, idp)
docs: Loads approved endpoints dynamically
          See super class satosa.frontends.saml2.SAMLFrontend#handle_authn_request
  
          :type context: satosa.context.Context
          :type binding_in: str
          :rtype: satosa.response.Response