The 101 (Switching Protocols) status code indicates that the server understands and is willing to comply with the client’s request, via the Upgrade header field, for a change in the application protocol being used on this connection. The server MUST generate an Upgrade header field in the response that indicates which protocol(s) will be switched to immediately after the empty line that terminates the 101 response. (RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content)


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