In microservice-based architectures, many microservices run with their own IP addresses and ports; consequently, it is very difficult to manage the location of each instance for clients. The diversity of protocols is another concern for clients. As a result, it makes sense to implement an API gateway service that provides a single entry point to all microservices without the need to remember the location of each microservice. An API gateway is responsible for request routing, composition, and protocol translation.

In Chapter 6: Testing of Microservices, we'll explore various approaches and strategies for testing microservices.