HTTP Status Code Lookup
Enter an HTTP status code and instantly see its meaning, category, common causes, and debugging context.
Enter a 3-digit HTTP response status code.
HTTP status code classes
The first digit tells you the response family. Use it to decide whether the request succeeded, redirected, failed because of the client, or failed on the server.
The server received the request and processing is continuing.
The request was accepted and completed successfully.
The client needs to follow another URL or use a cached response.
The request is invalid, unauthorized, forbidden, missing, or otherwise cannot be processed.
The server or upstream service failed while trying to handle a valid request.
Common HTTP codes
HTTP response debugging checklist
- Confirm the exact URL, method, query string, and request headers.
- Check redirect chains before debugging the final response.
- Compare browser DevTools, curl output, and server logs for the same request.
- For 4xx responses, inspect authentication, permissions, validation, and route matching.
- For 5xx responses, inspect application errors, proxy logs, and upstream timeouts.
What is an HTTP status code?
HTTP status codes are standard server responses that tell the client whether a request succeeded, failed, or needs more action.
This tool helps you quickly understand success, redirect, client error, and server error response categories.
How to use the HTTP Status Code Lookup
- Enter a 3-digit HTTP status code.
- The tool shows its title, category, and explanation.
- You can also click one of the popular examples below.
Tips
- 2xx means success.
- 3xx means redirection.
- 4xx means client-side error.
- 5xx means server-side error.
Related HTTP debugging tools
After checking a status code, inspect redirects, headers, curl requests, and security headers to understand the full response behavior.
Trace HTTP redirects, inspect 301/302 chains, and verify final destination URLs.
Parse raw HTTP headers into JSON and readable key-value pairs.
Parse cURL commands into method, URL, headers, query parameters, and body instantly.
Analyze HTTP security headers and get a security grade for your website.
Related guides
Learn the workflow behind this tool and what to check next.
How to debug redirects and HTTP status codes
A practical workflow for checking redirect chains, understanding 301 vs 302, diagnosing 404 and 500 responses, and confirming the final URL.
How to check redirects before an SEO migration
A migration checklist for confirming old URLs redirect cleanly, final pages are indexable, and sitemap and robots.txt signals agree.
How to debug JSON API payloads
A practical workflow for formatting JSON, finding syntax errors, validating payload shape, and checking response status when API data looks wrong.
HTTP status code checks before debugging responses
Status codes explain the response category, but redirects, cache behavior, headers, and client expectations determine the real fix.
Confirm the code source
Check whether the status comes from the application, reverse proxy, CDN, load balancer, or upstream service.
Review redirect intent
Use 301, 302, 307, or 308 deliberately because permanent and temporary redirects affect browsers and search engines differently.
Inspect headers
Look at cache, location, content type, authentication, and security headers when a status code alone is not enough.
Match API contracts
For APIs, confirm that errors use documented codes, response bodies, and retry behavior clients can handle.
Privacy and usage
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