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1xx Informational
4 status codes
These codes indicate that the server has received the request headers and the client should continue to send the body, or that the server is switching to a different protocol. These are provisional responses with no actual body content.
| Code | Title | Description | RFC |
|---|---|---|---|
| 100 | Continue | The server has received the request headers and the client should proceed to send the request body. | RFC 7231, Section 6.2.1 |
| 101 | Switching Protocols | The server is switching protocols as requested by the client via the Upgrade header. | RFC 7231, Section 6.2.2 |
| 102 | Processing | The server has received and is processing the request, but no response is available yet (WebDAV). | RFC 2518, Section 10.1 |
| 103 | Early Hints | The server can send early hints to preload resources while the final response is being prepared. | RFC 8297 |
Last updated: 21 Jun 2026
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