Node.js: faking HTTP requests for form testing

I'm currently learning node.js (Windows) and I have to test fake requests. I've been searching, saw some possible solutions but I can't implement them. So far I can only start the server with get, post, put and delete methods, but not with 'foo' or something similar

var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var fs = require("fs");

var urlencodedParser = bodyParser.urlencoded({ extended: false })

app.use(express.static('public'));

app.get('/index.html', function (req, res) {
   res.sendFile( __dirname + "/" + "index.html" );
})

app.post('/process_post', urlencodedParser, function (req, res) {

   response = {
      fname:req.body.fname,
      surname:req.body.surname,
      age:req.body.age,
      phone:req.body.phone,
      city:req.body.phone,
      email:req.body.email,
      country:req.body.country,
      postal_code:req.body.postal_code,
      password:req.body.password
   };
   console.log(response);
   res.end(JSON.stringify(response));

var server = app.listen(8081, function () {
   var host = server.address().address
   var port = server.address().port

   console.log("Listening at http://%s:%s", host, port)

})

If I start the server with other method I get an error like "app.foo is not a function" in the console. Can someone help me out?

via glassraven