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bouncy.js

// # Bouncy

var bouncy = require('bouncy')
  , fs     = require('fs')
  , path   = require('path')
  , servers = {}

fs.watchFile(path.join(__dirname, 'servers.json'), function(curr, prev) {
  console.log("Watching servers.json");
  if (curr.mtime.getTime() !== prev.mtime.getTime()) {
    fs.readFile(path.join(__dirname, 'servers.json'), 'utf8', function(err, data) {
        if (err) {
          console.log(err);
        } else {
          servers = JSON.parse(data);
          console.log(servers);
        }
      });
  }
});

bouncy(function(req, bounce) {
  console.log("Host: ", req.headers.host);
  // Run through each property and value
  if (req.headers.host in servers) {
    bounce(servers[req.headers.host]);
  } else {
    bounce(8081);
  }
}).listen(8000);