HTTP/2 is now available through a public beta for all Heroku Apps

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Heroku has announced public beta support for HTTP/2, which significantly improves web app performance by delivering content quicker and more efficiently, allowing multiple requests to travel simultaneously, and reducing waiting times. Upgrading to HTTP/2 requires a valid TLS certificate and can be enabled on Common Runtime apps or Private and Shield Spaces apps.

Improved Heroku App Performance with HTTP/2

How to Turn On HTTP/2 For Your Application