title: How do I encode angle brackets in servicestack json response
body: <p>I have a customer who wants to ensure that responses from our JSON web service do not contain HTML.  So instead of returning a string containing angle brackets they want encoded angle brackets.  </p>
  
  <p>Two questions:</p>
  
  <ul>
  <li>if I return content type application/json do I need to do this?</li>
  <li>how can I do this globally in ServiceStack?</li>
  </ul>