减少Google Cloud Endpoints请求响应标头大小

I'm using a Google Cloud App Engine and Google Cloud Endpoints API for my backend for an Android app.This is all in Java. I passing Json through to the backend. When I call an API method in the Endpoints from the Android App, I get an HTTP response from the App Engine. To reduce the download data load on my App I've reduced the body of the response as much as I can, i've set it up so that most of the time the message in the body is just a 'success' message and a custom ID tag. I'm using a Google Cloud App Engine and Google