title: iPhone - Checking to see if file needs update / update
body: <p>I'm trying to make a simple application that checks to see if a .txt file on the iPhone needs updated. Right now I'm checking the html header of last modified, and I want to compare this to the file within my iPhone. If the website's date is later than the file on the iPhone, the iPhone downloads and replaces the file. </p>
  
  <p>I'm using NSURL and having a pretty hard time with downloading the file.</p>
  
  <p>Thanks in advance</p>