server.js

"use strict";

var http = require("http");
var Unblocker = require("unblocker");

var unblocker = Unblocker({});

var server = http
  .createServer(function (req, res) {
    // first let unblocker try to handle the requests
    unblocker(req, res, function (err) {
      // this callback will be fired for any request that unblocker does not serve
      var headers = { "content-type": "text/plain" };
      if (err) {
        res.writeHead(500, headers);
        return res.end(err.stack || err);
      }
      if (req.url == "/") {
        res.writeHead(200, headers);
        return res.end(
          "Use the format http://thissite.com/proxy/http://site-i-want.com/ to access the proxy."
        );
      } else {
        res.writeHead(404, headers);
        return res.end("Error 404: file not found.");
      }
    });
  })
  .listen(8080);

// allow unblocker to proxy websockets
server.on("upgrade", unblocker.onUpgrade);

console.log("proxy server live at http://localhost:8080/");