Proxy express app which allows passthrough requests (in order to maintain static IP)

static-proxy.js

// BASE SETUP
// =============================================================================

// call the packages we need
var express    = require('express');     // call express
var app        = express();              // define our app using express
var bodyParser = require('body-parser'); // allows parsing of post params
var request    = require('request');     // enable performing http requests

// configure app to use bodyParser()
// this will let us get the data from a POST
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.use('/api', app.router);

var port = process.env.PORT || 8080;     // set our port

// test route to make sure everything is working (accessed at GET http://localhost:8080/api)
app.get('/', function(req, res) {
  res.json({ message: 'hooray! welcome to our api!' });
});

app.post('/proxy', function(req, res) {
  var params       = req.body,
      url          = req.body.url,
      method       = req.body.method || 'POST';

  method = method.toUpperCase();

  // ensure we have a URL to get/post to
  if (!url) { return res.json({ error: 'missing url' }) };

  delete params.url;
  delete params.method;

  var headers = {
    'User-Agent':   'request',
    'Content-Type': 'application/x-www-form-urlencoded'
  };

  var options = {
    url: url,
    method: 'GET',
    headers: headers,
    qs: params
  };

  if (method === 'POST') {
    options = {
      url: url,
      method: 'POST',
      headers: headers,
      form: params
    }
  }

  request(options, function(error, response, body) {
    res.json({
      status: response.statusCode,
      body: body,
      error: error
    });
  });
});


// START THE SERVER
// =============================================================================
app.listen(port);
console.log('Magic happens on port ' + port);