As far as I know, azure websites are still hosted on IIS 8.0 that doesn't support HTTP/2. When is Microsoft planning to upgrade this infrastructure?
I received an email for an update of the Azure App Service/Azure Functions infrastructure to Windows 2016 with the HTTP/2 support.
This update is planned from 4 december 2017 to january 2018.
But we don't know when the HTTP/2 protocol will be generally available, there will be a new communication at this time.
Apparently the switch to Windows 2016 (with HTTP/2) has started and it's being rolled our. Source - https://feedback.azure.com/forums/169385-web-apps/suggestions/9552936-enable-http-2-on-azure-web-app...