How to enable HTTP2 for AZURE App Gateway with WAF?

Question

Have some Windows Server 2019 with IIS vms running behind Azure App Gateway with WAF. Looking at the chrome network trace of the web apps running on those server, each http request is showing http 1.1.

I read here that Azure now supports HTTP2. What are the pre-requisites and steps for enabling HTTP/2 for my ASP.NET web apps running on Windows Server 2019 / IIS VMs behind Azure App Gateway with WAF?

Answer 1

Is there any update on upstream grpc or http/2 communication support for WAF. It is high demand now.

Answer 2

Thanks for asking question! Yes, you are right HTTP/2 protocol support is available to clients that connect to application gateway listeners only. The communication to back-end server pools is over HTTP/1.1 But by default, HTTP/2 support is disabled and you need to select ‘enabled’ from portal or use below PowerShell command for this.

$gw = Get-AzApplicationGateway -Name test -ResourceGroupName hm

$gw.EnableHttp2 = $true

Set-AzApplicationGateway -ApplicationGateway $gw

You may also refer to below links for more details:

https://learn.microsoft.com/en-us/azure/application-gateway/configuration-overview#additional-protocol-support

https://learn.microsoft.com/en-us/azure/web-application-firewall/ag/application-gateway-web-application-firewall-portal

Answer 3

Is there any update to when HTTP2 upstream will be supported?
Currently, it makes GRPC total incompatible unless you want to host GRPC alongside GRPC web.

Is there a ticket we can follow related to its implementation?