Load custom maintenance page to Heroku

Question

Heroku can display custom maintenance page:

heroku config:set MAINTENANCE_PAGE_URL=http://some_server/my_page.html

This requires presence of some website where the page will be always online.

Could the maintenance page be loaded into Heroku once and forever?

Answer 1

No, since there will be no way for the Heroku router to show it if there is a maintenance problem on Heroku.

The canonical way is to put that page on Amazon S3, or any other provider that can serve static pages.