app.js

'use strict';
var request = require('request-promise');
var P = require('bluebird');

// Home page
module.exports.home = (event, context, callback) => {
  const response = {
    statusCode: 200,
    body: JSON.stringify({
      message: 'Go Serverless v1.0! Your function executed successfully!',
      input: event,
    }),
  };

  callback(null, response);
};

/// Handler for /travel/{url}
module.exports.travel = (event, context, callback) => {
  // Get the url from the resource path.
  // Get the html.
  // Turn it into a successful request.
  // Attach the Node.js callback onto the end.
  
  P.try( () => {
    var url = getURLFromPath(event.path);
    var htmlPromise = request('http://' + url);
    var response = htmlPromise.then(make200Reponse);
    return response;
  }).catch(make500Response).asCallback(callback);
}

// Assumes /travel/{path}
function getURLFromPath(path) {
  return path.substring(8);
}

// Takes an html body and wraps it in a 200 response
function make200Reponse(body) {
  return {
    statusCode: 200,
    headers: {
      'Content-Type': 'text/html',
      'Access-Controll-Allow-Origin': "*",
    },
    body: html,
  }
}

function make500Response(err) {
  return {
    statusCode: 500,
    headers: {
      'Content-Type': 'text/html',
      'Access-Controll-Allow-Origin': "*",
    },
    body: JSON.stringify(err),
  }
}