def stream_request_body(cls):
    if not issubclass(cls, RequestHandler):
        raise TypeError("expected subclass of RequestHandler, got %r", cls)
    cls._stream_request_body = True
    return cls
Apply to `RequestHandler` subclasses to enable streaming body support.
dataset/ETHPy150Open RobotWebTools/rosbridge_suite/rosbridge_server/src/tornado/web.py/stream_request_body