var express = require('express');
var ajax = require('request-ajax');

var app = express();

app.get('/', function(req, res, next){
  ajax({
    // only JSON API is supported
    url: 'http://my-api.com/users.json'
    // your API auth
    clientId: process.env.CLIENT_ID,
    clientSecret: process.env.CLIENT_SECRET,
    // callbacks
    error: function(apiRequestError, apiResponse, statusCode) {
      next(apiRequestError || new Error('API error: ' + apiResponse.body));
    },
    success: function(data, apiResponse, statusCode) {
      var userCount = data.length;
      res.send('user count: ' + userCount);
    },
    complete: function(apiRequestError, isApiSuccess, apiResponse) {
      // ...
    }
  });
});

ajax({
  url: 'https://my-api.com/users.json',
  prefilterUrl: function(url) {
    return url && url.replace(new RegExp('^https://'), 'http://');
  }
});

headers: {
  'X-FOO': 'BAR'
}

requestOptions.auth = {
  bearer: options.accessToken
};

requestOptions.headers.Authorization = 'Basic ' + new Buffer(options.apiClientId + ':').toString('base64');
requestOptions.headers.Origin = options.origin;

requestOptions.auth = {
  user: options.clientId,
  pass: options.clientSecret
};