问题
I have setup a custom domain with Firebase Hosting (eg. myapp.domain.com).
How can one redirect (or turn off) the default Firebase Hosting URL (eg. myapp.firebaseapp.com) so that the app is only accessible from the custom domain?
回答1:
You cannot turn off the subdomain. Your app will always be available on https://myapp.firebaseapp.com and whatever custom domain you've set up.
To redirect people, you can add a canonical link to your HTML:
<link rel="canonical" href="http://myapp.domain.com/" />
Read more about that in Specify your canonical on the Google Webmaster Central Blog.
来源：https://stackoverflow.com/questions/34212039/redirect-to-firebase-hosting-custom-domain