in lib/src/copy/web_socket_impl.dart [267:280]
void _lengthDone() {
if (_masked) {
if (!_serverSide) {
throw WebSocketChannelException('Received masked frame from server');
}
_state = MASK;
} else {
if (_serverSide) {
throw WebSocketChannelException('Received unmasked frame from client');
}
_remainingPayloadBytes = _len;
_startPayload();
}
}