Inspect HTTP Status Codes & Headers Fast & Comprehensive
Look up standard HTTP response codes and security headers with RFC definitions, common causes, and backend response snippets.
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How to Use HTTP Status Code & Header Inspector
- 1
Search or Filter Codes
Search by number (e.g. 404, 500) or filter by category pills (2xx, 3xx, 4xx, 5xx).
- 2
Inspect Technical Details
Review RFC definitions, caching rules, and common trigger causes.
- 3
Copy Response Snippets
Copy backend implementation code for Next.js, Node.js Express, Python FastAPI, or PHP.
Frequently Asked Questions
4xx codes indicate client-side errors (e.g. 400 Bad Request, 401 Unauthorized, 404 Not Found), whereas 5xx codes indicate server-side failures (e.g. 500 Internal Server Error, 502 Bad Gateway, 503 Service Unavailable).
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