HTTP Status Code Lookup
Search every HTTP status code with what it means and when to use it.
HTTP Status Code Lookup
Developer tool running locally in browser
What does HTTP Status Code Lookup do?
A searchable reference for every HTTP status code, with the specification meaning, practical guidance on when to send it, and the common mistakes. Includes the codes people forget, such as 410, 422 and 429.
How to Use HTTP Status Code Lookup
- 1Search for a codeBy number, name or what you are trying to express.
- 2Read the meaningThe specification definition plus practical guidance.
- 3Check the notesCommon mistakes and SEO implications are called out.
Key Features
- Every registered status code from 100 to 511
- Search by number, name or description
- Practical guidance on when each is appropriate
- SEO notes for the redirect and error codes that affect indexing
- Grouped by class with plain-English category summaries
Frequently Asked Questions
What is the difference between 301 and 302?
301 is permanent — search engines transfer ranking signals to the new URL and browsers cache it aggressively. 302 is temporary and keeps the original URL indexed. Use 301 for a genuine move, 302 for a temporary diversion such as maintenance.
When should I use 404 versus 410?
404 means not found, possibly temporarily. 410 means gone permanently and never coming back. Search engines drop 410 URLs faster, so use it when you have deliberately removed content.
What does 429 mean?
Too Many Requests — you have hit a rate limit. A well-behaved API includes a Retry-After header telling you how long to wait, and clients should back off exponentially rather than retrying immediately.
Should an API return 200 with an error in the body?
No. Status codes exist so clients, proxies and monitoring can understand outcomes without parsing the body. Use 4xx for client mistakes and 5xx for server failures, and put the detail in the body.
Your data and files are processed strictly inside your browser. No data is stored, logged or uploaded to any server.
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