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
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