@Override
    protected void handleInterceptedStream(InterceptedStream<OutputStream> stream) {

        // Acknowledge that the stream is ready to receive data
        sendAck(stream.getIndex(), "OK", GuacamoleStatus.SUCCESS);

    }
Handles a single "sync" instruction, updating internal tracking of
client render state.

@param instruction
    The "sync" instruction being handled.
guacamole/src/main/java/org/apache/guacamole/tunnel/OutputStreamInterceptingFilter.java