Jeff Harris made a version of the vintage DOOM game that is controlled by a HTTP link with JSON !

http://1amstudios.com/2017/08/01/restful-doom/

The underlying TCP/IP stack is handled by the SDL framework.

• C source code
• Real-time processing, no lag allowed
• simple set of commands

Now, what makes my source code interesting ? Look at the video : each command is written in text. There is a sort of GUI but it's not tailored to the application. OTOH, using a file server allows the developer to also embed a GUI in HTML/JS that makes the interface smoother and more powerful. Instead of writing each command, write JS to handle dynamic HTML elements that react to events in real-time on your browser !