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101
Informational

101 Switching Protocols

The server is switching protocols as requested by the client.

Description

The 101 Switching Protocols response indicates that the server accepts the client's request to switch protocols. This is commonly seen during WebSocket upgrades.

The server sends this response with an Upgrade header indicating the protocol it's switching to.

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Related Status Codes

100
100 Continue
The server has received the request headers and the client should proceed to send the request body.
 102
102 Processing
Server has received the request and is still processing it — no response is ready yet.
 103
103 Early Hints
Used to return some response headers before the final HTTP message.

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