title: /healthz route of an app deployed on Google App Engine returns 404
body: <p>HTTP requests for a <code>/healthz</code> route on an app deployed on Google App Engine don't seem to reach the <code>/healthz</code> endpoint within the app. <br>
  Instead, a <code>404</code> page is served, apparently from the GCP infrastructure. <br>
  Can I know how to override this behaviour and make these requests reach my app?</p>
  <p>Thank you.</p>
  <p><a href="https://i.stack.imgur.com/WHyPX.png" rel="noreferrer"><img src="https://i.stack.imgur.com/WHyPX.png" alt="enter image description here" /></a>. <br></p>
  <p>A bit more background:</p>
  <p>I'm deploying a <a href="https://www.streamlit.io/" rel="noreferrer">Streamlit</a> app on Google App Engine.<br>
  Streamlit web UI appear to be sending requests to the <code>/healthz</code> endpoint periodically, and when these requests fail, Streamlit app stops working and displays an error message as below.</p>
  <p><a href="https://i.stack.imgur.com/oF6qW.png" rel="noreferrer"><img src="https://i.stack.imgur.com/oF6qW.png" alt="enter image description here" /></a></p>