Free browser tool
HTTP Status Code Reference
Search common HTTP response codes and quickly identify their category and meaning.
When to use the HTTP Status Code Reference
Use it when logs, monitoring or an API return a status code and you need to know what it means and who is likely at fault.
Examples
- 502 from Nginx usually means the upstream app crashed or is not listening.
- 301 vs 302: permanent vs temporary redirect, which matters for SEO.
Common mistakes
- Returning 200 for error pages, which hides problems from monitoring and search engines.
- Using 302 for permanent moves and losing ranking signals.