set host/port

server.js

 let ws = require("ws");
 let mime = require('mime-types')
 
+let port = process.env.PORT || 8080;
+let host = process.env.HOSTNAME || "127.0.0.1";
+
 let sessions = {};
 
 class Session {
 		res.end("Redirecting...");
 	}
 });
-server.listen(8080);
+server.listen(port, host);
+console.log(`Listening to ${host}:${port}`);
 
 let wss = new ws.Server({ server });