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Provides developers and DevOps with complete definitions, category explanations, and RFC specification sources for HTTP status codes.
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When your website request returns a 404 or 500, do you know its exact meaning and how to handle it? The HTTP Status Code Lookup tool systematically organizes the HTTP protocol response codes defined by IETF RFC standards. It parses each three-digit status code (e.g., 200, 301, 404, 500) into clear English and Chinese definitions, its category (1xx Informational, 2xx Success, 3xx Redirection, 4xx Client Error, 5xx Server Error), and its corresponding RFC specification source.
Q: What is the difference between HTTP 404 and 410 status codes?
Both indicate client errors, but their semantics differ. "404 Not Found" means the server cannot find the requested resource. "410 Gone" explicitly indicates that the resource has been permanently deleted and will not be restored in the future. The 410 status code helps search engines update their indexes.
Q: What does "(RFC 7231)" after a status code mean?
This indicates that the definition and specification of the status code originate from the RFC 7231 document published by the IETF. RFCs are internet technology standard documents; annotating the RFC number helps developers trace the most authoritative technical definitions.
This tool is a static reference manual and does not perform network request testing. Some status codes (like 306) have been deprecated by new specifications but may still appear in legacy systems, so please be aware of compatibility. The tool's information is based on public RFC standards; actual implementations may vary slightly depending on server, framework, or CDN configurations.
For developers, understanding status code categories is more important than memorizing individual codes. When encountering a 4xx error, prioritize checking the client request (URL, permissions, format); for a 5xx error, troubleshoot server-side logic, dependent services, or resource limits. A typical example: uploading a file that is too large might return a "413 Payload Too Large", while a server processing timeout might return a "504 Gateway Timeout". We recommend using this tool as a quick reference guide in conjunction with browser developer tools (Network panel) to diagnose network issues more efficiently.
