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HTTP Status Code Reference

Complete HTTP status code reference guide with detailed descriptions, usage examples, RFC references, and practical guidance for web developers and API designers.

HTTP Status Code

3 characters
Enter an HTTP status code (100-599) to look up

Output

Output will appear here

How It Works

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Paste, type, or upload your data directly into the http status code reference. All processing happens locally in your browser for complete privacy and security.

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Process Instantly

Click the process button or enable auto-processing for real-time results. Lightning-fast performance with immediate feedback and validation.

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Frequently Asked Questions

What are the main HTTP status code categories?
1xx (Informational), 2xx (Success), 3xx (Redirection), 4xx (Client Error), and 5xx (Server Error). Each category indicates the type of response from the server.
When should I use 422 vs 400?
Use 400 for malformed requests (syntax errors), and 422 for well-formed requests that fail semantic validation (business logic errors).
What's the difference between 401 and 403?
401 means authentication is required or failed (login needed), while 403 means the user is authenticated but lacks permission for the resource.
Which status codes are most commonly used?
Most common: 200 (OK), 201 (Created), 204 (No Content), 301/302 (Redirects), 400 (Bad Request), 401 (Unauthorized), 403 (Forbidden), 404 (Not Found), 422 (Unprocessable Entity), 500 (Internal Server Error), 502 (Bad Gateway), 503 (Service Unavailable).
How do I choose between 301 and 302 redirects?
Use 301 for permanent redirects (SEO juice transfers, caching encouraged) and 302 for temporary redirects (original URL will be used again).

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