Context

When making requests between services in your application, you may need to understand how internal network communication works and whether to use internal or public URLs for service-to-service communication.

Answer

Services within the same cluster can communicate with each other using internal network addresses. Here are the key points about internal network communication:

• Internal URLs can be found in your app's service Networking tab

• Internal URLs are stable and do not change

• Internal URLs are only used for service-to-service communication within the cluster

• External/public URLs always use public DNS routing

• Internal service requests are automatically load balanced using a round-robin algorithm