title: Good alternative for user session in high traffic web application?
body: <p>What would be good/scalable user session alternative in following scenario:  </p>
  
  <ul>
  <li>users don't have to have cookies enabled  </li>
  <li>URL query string restriction of 255 characters is imposed   </li>
  <li>lot of GET requests (no hidden form fields)  </li>
  <li>application runs on several servers (web farm)  </li>
  <li>some users connect over proxy (same IP)  </li>
  <li>users connect over HTTPS  </li>
  <li>50 000 concurrent users</li>
  </ul>