This is a silly server which alternatively tells a raspberry pi to turn something ON and OFF on GPIO Pin 17.

There are numerous prerequisites:
RPi Side:
Python
GPIO library: https://pypi.python.org/pypi/RPi.GPIO
LEDs, Resistors etc... Something to turn ON and OFF!

Server side:
Nodejs

It should then run with:
Server side: 	nodejs main.js
RPi side:	./main.py <hostname>

Link To Picture of Pi: https://drive.google.com/file/d/17wHNB3yZVLbdA9fCEY5hhBsRtx88sOJT_w/view?usp=sharing

Link To Video of thing in action: https://drive.google.com/file/d/1FXKW_qITRJqjjtluWW0T8ZcT3IdQABATdw/view?usp=sharing