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In Cloudfoundry what is the URL of an application?

Is it of the type Domain.subdomain or subdomain.domain?

It depends a lot. When you push your application, you can do nothing and rely on the defaults. The default will be for a route to be mapped to your app that is app-name.default-domain. You as a developer will set the app name and your platform operator will pick the default domain. There may be other domains available, but there's always at least one which is the default domain for apps.

Beyond that, you can control what routes are mapped to your app. If you include a manifest.yml file, you can include a routes: block, which lets you add one or more routes to your app.

Ex:

- routes:
 - route: www.example.com
 - route: www.example-other.com

https://docs.cloudfoundry.org/devguide/deploy-apps/manifest.html#routes

You could also cf push --no-start your app, then run cf map-route to add routes and finally run cf start. That would be if you're not using a manifest.yml file.

Other interesting things you can do:

• 
  cf push --no-route which doesn't assign any route. This is useful for non-web apps.


• 
  cf push --random-route which generates a random host name instead of using your app's name.


• 
  cf push --route-path which allows you to map not only a domain, but also a path. Ex: www.example.com/api/v2 would send only requests to /api/v2 to the given app.

Historically, you could set domain, domains, host and hosts in your manifest.yml file and you'd get various combinations of routes mapped to your app. These options have been deprecated though and shouldn't be used going forward.

https://docs.cloudfoundry.org/devguide/deploy-apps/manifest.html#route-attribute