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Description

The HTTP 101 Switching Protocols response code indicates a protocol to which the server switches. The protocol is specified in the Upgrade request header received from a client.

The server includes in this response an Upgrade response header to indicate the protocol it switched to.

The process is described in the following article: Protocol upgrade mechanism

See Also

Source: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/101

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