nodejs-server.js

ar http = require('http');
var fs = require('fs');
var util = require('util');

var fileCache;
var sendFile = function(conn, file) {
       conn.writeHead(200, {"Content-Type": "text/html", "Content-Length": file.length});
       conn.write(file);
       conn.end();
}
http.createServer(function (req, res) {
  if (fileCache == undefined) {
        fs.readFile("foo.html", function(err, file) {
                fileCache = file;
                sendFile(res, fileCache);
        });
  } else {
        sendFile(res, fileCache);
  }

}).listen(8080, 'localhost');

vertx-server.js

load('vertx.js')
var fileCache;
var sendFile = function(req, file) {
    req.response.headers["Content-Length"] = file.length()
    req.response.headers["Content-Type"] = "text/html"
    req.response.end(file)
}
vertx.createHttpServer().requestHandler(function(req) {
  if (fileCache == undefined) {
        vertx.fileSystem.readFile("httpperf/foo.html" function(err, file) {
                fileCache = file;
                sendFile(req, fileCache);
        });
  } else {
        sendFile(req, fileCache);
  }

  });
}).listen(8080, 'localhost');