This post is an in-depth explanation of HTTP (Hypertext Transfer Protocol), the core foundation of the internet. Whenever your frontend (browser or mobile app) communicates with a backend server, it happens through HTTP. The post explains that HTTP is inherently stateless — meaning the server does not remember previous interactions and treats every new request as independent. It also covers the different parts of an HTTP message (method, URL, headers, body) and their roles in detail. Headers are compared to address labels on a courier parcel that carry important extra information (metadata). The post further discusses API design best practices, including the correct use of HTTP methods (GET, POST, PUT, PATCH), CORS (Cross-Origin Resource Sharing), the importance of status codes (200, 404, 500), and techniques like caching and compression to improve server performance. Key Concepts Breakdown 1. Statelessness Simple Explanation: The server does not store any memory of previous requests.…