server.js

var http = require('http');
var url = require('url');
var Feed = require('./rss');

var PORT = process.env.PORT || 8888;

function getFeedUrl(request) {
  return url.parse(request.url, true).query.url;
}

function writeError(err, response) {
  response.writeHead(500, {
    "Content-Type": "text/plain;charset=utf-8",
    "Access-Control-Allow-Origin": "*"
  });
  response.write(err + "\n", function() {
    response.end();
  });
}

function writeJsonResponse(rss, response) {
  response.writeHead(200, {
    "Content-Type": "application/json;charset=utf-8",
    "Access-Control-Allow-Origin": "*"
  });
  response.write(JSON.stringify(rss));
  response.end();
}

function handleRequest(request, response) {
  var feedUrl = getFeedUrl(request);
  var hasHttp = /^http:\/\/|https:\/\//.test(feedUrl);
  if (!hasHttp) {
    feedUrl = 'http://' + feedUrl
  }
  var isHttps = /^https:/.test(feedUrl);
  if (isHttps) {
    feedUrl = feedUrl.replace(/^https/, "http");
    console.log('try connect to non-https:', feedUrl);
  }
  console.log('try connect to:', feedUrl);
  Feed.load(feedUrl, function(err, rss) {
    if (err) {
      console.log('error', err);
      writeError(err, response);
    } else {
      writeJsonResponse(rss, response);
    }
  });
}


var server = http.createServer(handleRequest);

server.listen(PORT, function() {
  console.log("Sever started on %s", PORT);
});