Implementing synchronous communication

Synchronous communication means that we make a direct call from one service to another and wait for a response. Given all the fail-safes and retry policies that we could implement, we still evaluate the success of the call based on us receiving a response to our call.

In the context of our hospital management system, a simple query from the frontend will need to be done synchronously. If we need to see all the doctors in the system to present a list to the user, then we need to invoke a direct call to the doctors’ API microservice, which fetches the records from the database and returns the data with, more than likely, a 200 response that depicts success. Of course, this needs to happen as quickly and efficiently as possible, as we want to reduce the amount of time the user spends waiting on the results to be returned.

There are several methods that we can use to make an API call, and HTTP is the most popular. Support for HTTP calls...