HTTP Status Codes Reference
HTTP/1.1 standard status codes organized by category. Frequently used codes are highlighted in bold.
| Code | Name | Description |
|---|
Status Code Categories
- 1xx Informational: The request was received and is being processed.
- 2xx Success: The request was successfully processed.
- 3xx Redirection: Further action is needed to complete the request.
- 4xx Client Error: The request itself contains a problem.
- 5xx Server Error: The server failed to process a valid request.
Frequently Asked Questions
What is the difference between 401 and 403?
401 (Unauthorized) means authentication is required (not logged in), while 403 (Forbidden) means you are authenticated but lack permission for the resource.
What is the difference between 301 and 302?
301 (Moved Permanently) is a permanent move, 302 (Found) is temporary. For SEO, use 301 when permanent so search engines transfer authority to the new URL.
What is the difference between 500 and 502?
500 (Internal Server Error) is a generic server-side error, while 502 (Bad Gateway) means a gateway/proxy received an invalid response from the upstream backend.
Is 418 I'm a teapot a real standard?
It is a joke RFC (RFC 2324) defined on April Fools' Day 1998, but it is actually registered with IANA. It is not for production use, though some services use it as an Easter egg.