internal WebSocketRequest(HttpRequestMessage handshake, WebSocketFrame frame)
     : base(frame.Opcode, frame.Payload)
 {
     _handshake = handshake;
     _frame = frame;
 }
 internal WebSocketRequest(HttpRequestMessage handshake, WebSocketFrame frame)
     : base(frame.Opcode, frame.Payload)
 {
     _handshake = handshake;
     _frame     = frame;
 }