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@ -153,7 +153,7 @@ func (u *Upgrader) Upgrade(w http.ResponseWriter, r *http.Request, responseHeade
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challengeKey := r.Header.Get("Sec-Websocket-Key")
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if challengeKey == "" {
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return u.returnError(w, r, http.StatusBadRequest, "websocket: not a websocket handshake: `Sec-WebSocket-Key' header is missing or blank")
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return u.returnError(w, r, http.StatusBadRequest, "websocket: not a websocket handshake: 'Sec-WebSocket-Key' header is missing or blank")
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}
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subprotocol := u.selectSubprotocol(r, responseHeader)
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