title: How to update HttpEntity content?
body: <p>I have a HttpServletResponse. I'd like to get the content of its entity, change it and then send the response.</p>
  
  <p>Getting the content and changing it is simple : <code>response.getEntity().getContent()</code></p>
  
  <p>But writing back the modifications into the entity, ... I don't see how I can do it.</p>
  
  <p>Do you have any suggestions?</p>