In the case of a .NET monolithic application, if there is a need to access third-party components or external services, we use the HTTP client or another client framework to access the resources. In Chapter 2, Building Microservices, we developed Product service in such a way that it would work independently. But this was not the case; we mandatorily required a few services to interact with each other. So this is a challenge: having services communicate with each other. Both Product service and Order service are hosted on separate servers. Both these servers are independent of each other, are based on REST, and have their own endpoints via which they communicate with each other (when a service interacts with another service and vice versa, we refer to it as inter-service communication as well).
There are ways in which services communicate with each other; let's discuss them briefly:
- Synchronous: In this, the client makes a request to the remote service (called...