title: What can you specify in script setting of handler element in flexible environment for Google App Engine?
body: <p>I am trying out flexible environment in Google App Engine using <em>python 3</em>.
  However, I am figuring out what you can specify in <em>Handlers.script</em> section.</p>
  
  <p>According to this <a href="https://github.com/GoogleCloudPlatform/data-science-on-gcp/blob/706104284e12c18e82683b372a031018601d273c/02_ingest/monthlyupdate/app.yaml#L18" rel="nofollow noreferrer">sample code</a>, looks like you allowed to specify other than <em>auto</em> which was <em>only</em> setting you allowed to set in <a href="https://cloud.google.com/appengine/docs/standard/python3/config/appref#handlers_element" rel="nofollow noreferrer">standard environment</a>.</p>
  
  <p>So my question is in <em>flexible environment</em>, what are the <strong>syntax</strong> you are allowed to set?</p>
  
  <p>I appreciate if I could get some clarification with my question.</p>