title: OR statement in URL query string
body: <p>I need to support OR statement in REST API, and I don't know how to build right query string.
  Maybe, something like this?</p>
  
  <ul>
  <li>/rest?author=Obama&amp;author=McCain   </li>
  <li>/rest?author=Obama|McCain</li>
  </ul>
  
  <p>or maybe standard solution exists?</p>