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The Sec-WebSocket-Accept header is used in the websocket opening handshake. It would appear in the response headers. That is, this is header is sent from server to client to inform that server is willing to initiate a websocket connection.
No compatibility data found. Please contribute data for "http.headers.Sec-WebSocket-Accept" (depth: 1) to the MDN compatibility data repository.
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-WebSocket-Accept