servidor express scrap.

error de consola

_http_outgoing.js:335
    throw new Error('Can\'t set headers after they are sent.');
    ^

Error: Can't set headers after they are sent.
    at ServerResponse.OutgoingMessage.setHeader (_http_outgoing.js:335:11)
    at ServerResponse.header (/Users/diegoachury/node-projects/newspapers-huila/node_modules/express/lib/response.js:718:10)
    at ServerResponse.send (/Users/diegoachury/node-projects/newspapers-huila/node_modules/express/lib/response.js:163:12)
    at done (/Users/diegoachury/node-projects/newspapers-huila/node_modules/express/lib/response.js:957:10)
    at Immediate._onImmediate (/Users/diegoachury/node-projects/newspapers-huila/node_modules/express-handlebars/lib/utils.js:26:13)
    at processImmediate [as _immediateCallback] (timers.js:383:17)

Server-express.js

"use strict";

var express = require("express"),
    exphbs  = require('express-handlebars'),
    request = require("request"),
    cheerio = require("cheerio"),
    app     = express(),
    port    = process.env.PORT || 3002;
    //array
    var urlsArray = ['http://www.lanacion.com.co/', 'http://www.diariodelhuila.com/'];
    // todos
    app.get('/', function (req, res) {
      urlsArray.forEach(function (item, index, urlsArray) {
        console.log(item, index);
        request(item, function (err, resp, body) {
          if (!err && resp.statusCode === 200) {
            var $        = cheerio.load(body),
            pageURLs = [];

            if(index === 0 ){
              console.log("haciendo request: " + item );
              $('a.moduleItemTitle').map(function (i, links) {
                var articleText = $(links).text(),
                    articleLink = $(links).attr('href');

                    pageURLs.push({
                        link: articleLink,
                        desc: articleText
                    });
                });

                var dataNacion = JSON.parse(JSON.stringify(pageURLs));
                console.log("el valor dentro del IF " + JSON.stringify(pageURLs) );
                res.render('two', {dataNacion});
              }// cierra if nacion
              if (index === 1 ){
                console.log("haciendo request: " + item  );

                $('article header h1 a').map(function (i, links) {
                    var articleText = $(links).text(),
                        articleLink = $(links).attr('href');

                    pageURLs.push({
                        link: articleLink,
                        desc: articleText
                    });
                });
                var dataDiario = JSON.parse(JSON.stringify(pageURLs));
                console.log("el valor dentro del IF " + JSON.stringify(pageURLs) );
                res.render('two', {dataDiario});
              }
            }//cierra desicion
          }); //cierra request
        }); //cierra foreach
    });// cierra url get /


// manejador de plantilla con handlebar
app.engine('handlebars', exphbs({defaultLayout: 'main'}));
app.set('view engine', 'handlebars');

app.listen(port);

console.log('Your server goes on localhost:' + port);

two.handlebars

<h2>Diarios</h2>

<h2>diario del Huila</h2>
<ul>
  {{#each dataDiario}}
    <li><a href="{{this.link}}">{{this.desc}}</a> </li>
  {{/each}}
</ul>
<h2>diario la Nacion</h2>
<ul>
  {{#each dataNacion}}
    <li><a href="{{this.link}}">{{this.desc}}</a> </li>
  {{/each}}
</ul>