code: def make_upstream_request(self):
          "Return request object for calling the upstream"
          url = self.upstream_url(self.request.uri)
          return tornado.httpclient.HTTPRequest(url,
              method=self.request.method,
              headers=self.request.headers,
              body=self.request.body if self.request.body else Nonef make_upstream_request(self):
          "Return request object for calling the upstream"
          url = self.upstream_url(self.request.uri)
          return tornado.httpclient.HTTPRequest(url,
              method=self.request.method,
              headers=self.request.headers,
              body=self.request.body if self.request.body else None)
docs: Return request object for calling the upstream