Informational Status Codes in HTTP
From the HTTP Status Codes cheat sheet · 1xx Informational · verified Jul 2026
Informational Status Codes
Provisional responses requiring client to wait or continue
javascript
100 : Continue - Initial part received, continue sending
101 : Switching Protocols - Upgrading to different protocol
102 : Processing - Request received but not completed
103 : Early Hints - Preload resources while preparing response💡 Rarely used in practice except for WebSocket upgrades
⚡ 103 Early Hints can improve performance with preloading
📌 Most APIs skip directly to final status codes
Continue with HTTP Status Codes
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