title: How do I find the end-point for a Firebase function from a hosted page?
body: <p>From a hosted page I can call <code>firebase.functions().httpsCallable()</code>, but I don't want to do that.  I have an existing library that needs just the URL. </p>
  
  <p>The endpoint is available on the console, so it isn't supposed to be a secret.  If I look up the URL and hard-code it on the page, everything works fine, but that's not scalable.  </p>
  
  <p>Strangely, when I run the hosting locally (with <code>firebase serve</code>), there is a function <code>firebase.functions()._uri()</code> that returns the right answer, but as the underscore warns, it isn't available in a production deployment.</p>