text: var http = require('http');
  
  var finalhandler = require('finalhandler');
  var serveStatic = require('serve-static');
  
  var serve = serveStatic("./");
  
  var server = http.createServer(function(req, res) {
    var done = finalhandler(req, res);
    serve(req, res, done);
  });
  
  server.listen(8010);
  console.log('server on http://127.0.0.1:8010')
  
  // open http://127.0.0.1:8010/d3/index.html