Summary

We delved into the Request-EndPoint-Response (REPR) design pattern and learned that REPR follows the most foundational pattern of the web. The client sends a request to an endpoint, which processes it and returns a response. The pattern focuses on designing the backend code around the endpoint, making it faster to develop, easier to find your way around the project, and more focused on features than MVC and layers.

We also took a CQS approach to the requests, making them queries or commands, and depicting all that can happen in a program: read or write states.

We explored ways to organize code around such a pattern, from implementing trivial to more complex features. We built a technology stack to create an e-commerce web application that leverages the REPR pattern and a feature-oriented design. We learned how to leverage middleware to handle exceptions globally and how the ExceptionMapper library provides us with this capability. We also used gray-box testing to cover...