title: How to modify web content using apache proxy?
body: <p>I'm using apache server to test my browser. I want to insert some javascript to a web page, such as google.com to analyze the page content. </p>
  
  <p>Other debugging methods are limited by my browser to use. So I want to modify the page contents at the proxy end.</p>
  
  <p>Tank you very much!</p>