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HTTP Status Code Reference & Debugger

Instant lookup and debugging guide for all HTTP status codes (1xx-5xx) with RFC specifications and troubleshooting advice.

Frequently Asked Questions

What is an HTTP status code?

HTTP status codes are standard response codes issued by web servers to indicate whether a specific HTTP request was successfully completed.

What is the difference between 401 and 403?

401 Unauthorized means authentication is required or failed, while 403 Forbidden means the server understands who you are but refuses access.

Is this guide offline and client-side?

Yes, all status code lookups and specifications run entirely within your browser.