API Request Builder

HTTP (HyperText Transfer Protocol) is the foundation of data exchange on the web. Every time you load a page, submit a form, or call an API, your browser sends an HTTP request to a server and receives a response. A request consists of a method (GET, POST, etc.), a URL, headers (metadata), and optionally a body (data payload).

The most common methods are GET (retrieve data), POST (create), PUT (replace), PATCH (partial update), and DELETE (remove). Response status codes tell you the outcome: 2xx means success, 3xx means redirect, 4xx means client error (like 404 Not Found), and 5xx means server error.

This tool sends real HTTP requests from your browser using the Fetch API. Note that CORS (Cross-Origin Resource Sharing) restrictions may block requests to APIs that don't allow browser-based access. Public APIs like JSONPlaceholder, httpbin.org, and most REST APIs with CORS headers enabled will work perfectly. For APIs behind CORS restrictions, you'd need a backend proxy or a tool like Postman.