title: What am I missing? CasperJS web scraping returning NULL
body: <p>This is perplexing to me. I've got a casperJS script that scrapes pages just fine. But this one page returns null. This page (like others) is behind a cookied session.</p>
  
  <p>If I log the URL that it hits, and punch that into the web browser, I get the XML result. <a href="http://cl.ly/1d0A160o0Q2f" rel="nofollow">http://cl.ly/1d0A160o0Q2f</a></p>
  
  <p>But inside casperJS it is null for the result.</p>
  
  <pre><code>casper.thenOpen(url, function() {
      this.echo(this.getPageContent());
  });
  </code></pre>
  
  <p>That URL is the URL that works in the browser. And I've confirmed that at that point in the code Casper does have a valid cookie session. This URL is normally an AJAX call but works fine from the browser as a GET request. I don't know what I'm missing with Casper that would cause this to be NULL. I must be missing something.</p>