HTTP Status Codes: The Complete Guide for Web Developers

Every HTTP response includes a three-digit status code. Most developers know 200 (OK), 404 (Not Found), and 500 (Internal Server Error). But the full range of status codes gives you precise control over how clients, browsers, and crawlers handle your responses. The five classes 1xx Informational : The request was received, processing continues. 100 Continue : The server received the request headers and the client should send the body. Used for large uploads -- the client sends Expect: 100-continue and waits for confirmation before sending the potentially large body. 101 Switching Protocols : Used in WebSocket upgrades. The server agrees to switch from HTTP to WebSocket protocol. 2xx Success : The request was received, understood, and accepted. 200 OK : The standard success response. 201 Created : A new resource was created. Used for POST requests that create entities. The response should include a Location header pointing to the new resource. 204 No Content : Success, but no response b