— StatusCodeFYI
@statuscodefyi.com
Comprehensive reference for HTTP, SMTP, gRPC, DNS, WebSocket, FTP, and SIP status codes — with examples, comparisons, and interactive tools.
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About — StatusCodeFYI
StatusCodeFYI is an online reference for understanding status codes across seven communication protocols: HTTP, SMTP, gRPC, DNS, WebSocket, FTP, and SIP. Designed as a resource for developers and others working with web and network technologies, it explains how codes signal the outcomes of requests, messages, queries, connections, and file transfers.
The site brings together more than 258 status codes, with dedicated collections for each protocol. Its coverage ranges from HTTP responses and SMTP email replies to DNS query results, gRPC call outcomes, WebSocket connection closures, FTP transfer responses, and SIP multimedia-session signaling. Users can also explore 41 comparisons that clarify commonly confused codes, a glossary of 360 technical terms, and 172 guides on topics including debugging, caching, security, and protocol design. Four interactive tools support work with headers, status codes, and mock responses. StatusCodeFYI presents this material as a practical, cross-protocol encyclopedia, helping users look up code meanings, compare behaviors, and explore related networking concepts.
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