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HTTP Status Codes
Quick reference for HTTP response status codes. Search and learn what each code means.
1 1xx Informational
2 2xx Success
3 3xx Redirection
4 4xx Client Error
5 5xx Server Error
C Content Errors
Quick Reference
Success
Redirect
Client Error
Server Error
About the HTTP Status Codes
Every HTTP response starts with a three-digit status code. The first digit gives the class: 1xx information, 2xx success, 3xx redirect, 4xx client error, and 5xx server error.
How to use it
- 1 Search for a code or a word such as "redirect".
- 2 Read what it means and when servers send it.
- 3 Use the right code in your API or server.
Frequently asked questions
What is the difference between 301 and 302?
301 is a permanent redirect, so search engines move rankings to the new URL. 302 is temporary, so the old URL keeps its rankings.
What is the difference between 401 and 403?
401 means you are not authenticated (log in first). 403 means you are logged in but not allowed to access the resource.
What does a 503 error mean?
The server is temporarily unavailable, often because of maintenance or overload. Clients can retry later.