Is there a way to customize nginx proxy in google flexible appengine
<p>We are trying to running an application (a java servlet that connects to guacamole server) on flexible appengine, in our troubleshooting it looks like there is a nginx proxy on the google cloud instance (the instance from which docker image is running).</p>

<p>Is there a way we customize the nginx configuration the google cloud instance to help resolve our issues?</p>