Creating a TCP Listener in Unity for rendering pipeline on WEB

Hello all,

I am trying to make an webpage that request to Unity server for a rendered image of a specific angle.
The WEB server will be in Javascript and I am trying to figure out how to make a listener on the Unity server for web request.
The rest of the process is somehow figured out, but the part that gives me headache is the Unity server receiving request.
I am now thinking of making creating a TCP listener for any incoming request from the web server.

Can anybody help me out on this?
Any new ideas/suggestion will be a huge help