If we want to get all the debug info that is set in our .vcl file to get that info we need to add extra header to request, so it should look like.

Postman when used as desktop doesnt have browser plugin to add xdebug info to request, but solution is easy, just do this.
Add `XDEBUG_SESSION_START=PHPSTORM` to the query string and PHPStorm will catch the debug session as it would if you were using a browser extension.

Disabling caching on JSON API endpoints doesnt seem possible with using just below in your sevices file

Using JSON API or commerce api or even JSON API resources is great but it is limited to entities and whole architecture is aimed at them. This is fine in most cases but what if you want to output some config or some random data. You will need to get creative a bit. So what we do is then make custom drupal 8 controller, you setup the usual router yml like