@gen.coroutine
    def _execute(self, transforms, *args, **kwargs):
        self._transforms = transforms
        try:
            if self.request.method not in self.SUPPORTED_METHODS:
                raise HTTPError(405)
            self.path_args = [self.decode_argument(arg) for arg in args]
            self.path_kwargs = dict((k, self.decode_argument(v, name=k))
                                    for (k, v) in kwargs.items())
            # If XSRF cookies are turned on, reject form submissions without
            # the proper cookie
            if self.request.method not in ("GET", "HEAD", "OPTIONS") and \
                    self.application.settings.get("xsrf_cookies"):
                self.check_xsrf_cookie()

            result = self.prepare()
            if is_future(result):
                result = yield result
            if result is not None:
                raise TypeError("Expected None, got %r" % result)
            if self._prepared_future is not None:
                # Tell the Application we've finished with prepare()
                # and are ready for the body to arrive.
                self._prepared_future.set_result(None)
            if self._finished:
                return

            if _has_stream_request_body(self.__class__):
                # In streaming mode request.body is a Future that signals
                # the body has been completely received.  The Future has no
                # result; the data has been passed to self.data_received
                # instead.
                try:
                    yield self.request.body
                except iostream.StreamClosedError:
                    return

            method = getattr(self, self.request.method.lower())
            result = method(*self.path_args, **self.path_kwargs)
            if is_future(result):
                result = yield result
            if result is not None:
                raise TypeError("Expected None, got %r" % result)
            if self._auto_finish and not self._finished:
                self.finish()
        except Exception as e:
            self._handle_request_exception(e)
            if (self._prepared_future is not None and
                    not self._prepared_future.done()):
                # In case we failed before setting _prepared_future, do it
                # now (to unblock the HTTP server).  Note that this is not
                # in a finally block to avoid GC issues prior to Python 3.4.
                self._prepared_future.set_result(None)
Executes this request with the given output transforms.
dataset/ETHPy150Open RobotWebTools/rosbridge_suite/rosbridge_server/src/tornado/web.py/RequestHandler._execute