HTTP Status Code Reference
Complete reference for all major HTTP status codes — searchable, filterable, with detailed explanations and usage examples.
Understanding HTTP Status Codes
HTTP status codes are three-digit numbers returned by a server in response to a client's request. The first digit indicates the category: 1xx informational, 2xx success, 3xx redirection, 4xx client error, 5xx server error.
Correct use of status codes is essential for web APIs, SEO, and client-side error handling. For example, returning 200 for a deleted resource or 302 for a permanent move are common mistakes that affect search engine indexing and API clients.