title: 502 - Web server received an invalid response while acting as a gateway or proxy server on azure web app
body: <p>I have hosted one web app on azure but suddenly it started to give error. I am not what is the issue previously it was working very fine. Suddenly it stops working. </p>
  
  <p><strong>502 - Web server received an invalid response while acting as a gateway or proxy server.
  There is a problem with the page you are looking for, and it cannot be displayed. When the Web server (while acting as a gateway or proxy) contacted the upstream content server, it received an invalid response from the content server.</strong></p>