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This chapter delves into the heart of web application communication–REST APIs. In today's connected digital world, effective communication between different applications is paramount, and RESTful APIs play a pivotal role in facilitating this interaction.We start by exploring the basic fabric of the web: the HTTP protocol. We touch on the core HTTP methods such as GET, POST, PUT, and DELETE to see how they carry out CRUD (Create, Read, Update, Delete) operations in a RESTful context. We then turn our attention to HTTP status codes–the system's way of informing clients about the status of their requests–and HTTP headers.Since APIs evolve and managing these changes without disrupting...