By default, cf push assigns a route to every application. But some applications process data while running in the background, and should not be assigned routes.

You can use the no-route attribute with a value of true to prevent a route from being created for your application.

---
  ...
  no-route: true

The command line option that corresponds to this attribute is --no-route.

If you find that an application which should not have a route does have one:

1. Remove the route using the cf unmap-route command.
2. Push the app again with the no-route: true attribute in the manifest or the --no-route command line option.