Forward a SockJS connection to an upstream SockJS server.
Example: listening at port 8000, forwarding connections to port 8080.
const createProxy = require('sockjs-proxy');
const proxy = createProxy('http://localhost:8080/echo', { sockjs_url: 'http://cdn.jsdelivr.net/sockjs/1.0.1/sockjs.min.js' });
const server = http.createServer();
proxy.installHandlers(server, { prefix: '/echo' });
server.listen(8000, '0.0.0.0');