def _no_handler_for_request(self, environ, start_response, request_id):
    self._insert_log_message('No handlers matched this URL.', 2, request_id)
    start_response('404 Not Found', [('Content-Type', 'text/plain')])
    return ['The url "%s" does not match any handlers.' % environ['PATH_INFO']]
Entry point called by the operation framework.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/tools/devappserver2/server.py/Server._no_handler_for_request--crossover with--dataset/ETHPy150Open viewfinderco/viewfinder/backend/op/remove_viewpoint_op.py/RemoveViewpointOperation.Execute