title: Azure App Service Always On vs what is logged
body: <p>Why does Azure App Service Always On make two requests, one to my site ZZTESTSITE and second to ~1ZZTESTSITE? What is the Service Name preceded with tilde in the first request?</p>
  
  <pre><code>2017-06-20 17:17:02 ~1ZZTESTSITE GET / - 80 - 100.89.142.31 AlwaysOn - - zztestsite.azurewebsites.net 200 0 0 2945 451 15
  2017-06-20 17:17:02 ZZTESTSITE GET / X-ARR-LOG-ID=743965b6-d3e2-42b9-9353-7772f9fbc898 80 - ::1 AlwaysOn ARRAffinity=b5289afa9cd711b67c1fe9137a6e3ff232f80bd3fa1bd96e9fc89992472b4e57 - zztestsite.azurewebsites.net 200 0 0 11433 652 15
  </code></pre>