code: func pubsubPullHandler(c *router.Context) {
  	rc := requestContext(*c)
  	if !appengine.IsDevAppServer() {
  		rc.fail(403, "Not a dev server")
  		return
  	}
  	err := globalEngine.PullPubSubOnDevServer(
  		rc.Context, rc.Params.ByName("ManagerName"), rc.Params.ByName("Publisher"))
  	if err != nil {
  		rc.err(err, "Failed to pull PubSub messages")
  	} else {
  		rc.ok()
  	}
  }
docs: // pubsubPullHandler is called on dev server by developer to pull pubsub
  // messages from a topic created for a publisher.