Executes this request with the given output transforms.

async def _execute(
        self, transforms: List["OutputTransform"], *args: bytes, **kwargs: bytes
    ) -> None:
        """Executes this request with the given output transforms."""
        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 result is not None:
                result = await result
            if self._prepared_future is not None:
                # Tell the Application we've finished with prepare()
                # and are ready for the body to arrive.
                future_set_result_unless_cancelled(self._prepared_future, 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:
                    await self.request._body_future
                except iostream.StreamClosedError:
                    return

            method = getattr(self, self.request.method.lower())
            result = method(*self.path_args, **self.path_kwargs)
            if result is not None:
                result = await result
            if self._auto_finish and not self._finished:
                self.finish()
        except Exception as e:
            try:
                self._handle_request_exception(e)
            except Exception:
                app_log.error("Exception in exception handler", exc_info=True)
            finally:
                # Unset result to avoid circular references
                result = None
            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)