"websocket".equals(request.headers["Upgrade"], ignoreCase = true)
      val responseWantsWebSockets = response.webSocketListener != null
      if (requestWantsWebSockets && responseWantsWebSockets) {
        handleWebSocketUpgrade(socket, source, sink, request, response)
        reuseSocket = false
      } else {
        writeHttpResponse(socket, sink, response)
      }

      if (logger.isLoggable(Level.FINE)) {