title: Update Nutch to fetch parent of every URL fetched
body: <p>As I run Apache Nutch 1.4 crawler, I want to store some additional information. I want to store the parent of every URL.</p>
  
  <p>For example, I want to crawl a page a.html that has 2 anchor links to b.html and c.html So when I crawl a.html, I should get something like this :-</p>
  
  <pre><code>a.html null
  b.html a.html
  c.html a.html
  </code></pre>
  
  <p>I want to store something like this.
  I have read how nutch works and have run nutch in eclipse too. I also read fetcher.java and logged where it fetched content. But I got no success in knowing where Nutch fetches the child URLs of a given page. I think this step takes place after parsing step.</p>