Available since Summer 20 H2
If you want to use a proxy when communicating with your gateways, you can do so by editing the environment your gateway is in. This makes it possible to define different proxies (or no proxy at all) for your different environments. To do so go to Configuration > Environments.
All other outbound http traffic like calling APIs for notifications or webhooks don’t use a proxy. If you need this functionality please don’t hesitate to contact our customer support.