Source:          conn,
			State:           c.side,
			CheckUTF8:       true,
			SkipHeaderCheck: false,
			OnIntermediate:  controlHandler,
		}
		readDataInto := func(dst []byte, rw io.ReadWriter, s ws.State, want ws.OpCode) ([]byte, error) {
			dst = dst[:0]
			for {
				hdr, err := wsReader.NextFrame()
				if err != nil {
					return nil, err
				}
				if hdr.OpCode.IsControl() {