HTTP status codes indicate the result of a request. 2xx Success: 200 OK, 201 Created, 204 No Content. 3xx Redirect: 301 Moved Permanently, 302 Found (temporary redirect), 304 Not Modified. 4xx Client Error: 400 Bad Request, 401 Unauthorized, 403 Forbidden, 404 Not Found, 405 Method Not Allowed, 429 Too Many Requests. 5xx Server Error: 500 Internal Server Error, 502 Bad Gateway, 503 Service Unavailable, 504 Gateway Timeout. The most important ones for web developers: 200 (success), 301 (permanent redirect for SEO), 404 (page not found), and 500 (server error).
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HTTP Status Codes
Complete guide to HTTP status codes: 200, 301, 404, 500, and more explained.
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