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About This Guide

HTTP Status Codes is a free, open‑source reference guide for developers, system administrators, and anyone who works with HTTP. Our goal is to provide clear, concise, and actionable information about every HTTP status code — from the well‑known 404 to the obscure 511.

Why This Project Exists

HTTP status codes are everywhere, yet many developers only know a handful of them. When an error occurs, having a quick reference can save hours of debugging. This guide is built to be:

  • Complete – covers all official IANA‑registered codes plus popular unofficial codes from Nginx, Cloudflare, AWS, and others.
  • Practical – each page includes a "Golden Answer" summary, common causes, fix strategies, and FAQs.
  • Accessible – designed with a clean, minimal interface that works on any device, with dark mode support.
  • Open – all content is available under the Creative Commons CC BY‑SA 4.0 license, and the source code is available on GitHub.

What You’ll Find Here

  • 1xx Informational – provisional responses.
  • 2xx Success – successful requests.
  • 3xx Redirection – further action needed.
  • 4xx Client Errors – mistakes made by the client.
  • 5xx Server Errors – problems on the server side.
  • Unofficial Codes – platform‑specific codes from Nginx, Cloudflare, AWS, and others.

Each code page includes a description, a "Golden Answer" summary, detailed causes, practical fix strategies, and frequently asked questions.

License

This work is licensed under the Creative Commons Attribution‑ShareAlike 4.0 International License (CC BY‑SA 4.0).

You are free to:

  • Share – copy and redistribute the material in any medium or format.
  • Adapt – remix, transform, and build upon the material for any purpose, even commercially.

Under the following terms:

  • Attribution – you must give appropriate credit, provide a link to the license, and indicate if changes were made.
  • ShareAlike – if you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.

Full license text: https://creativecommons.org/licenses/by-sa/4.0/

Contributing

We welcome contributions! If you find an error, want to add a new code, or improve the content, please open an issue or submit a pull request on GitHub.

Contact

For questions, suggestions, or feedback, you can reach us at hello@httpstatus.guide.