Enable HTTP/3 in Azure WebApp running .NET6 on Linux

Tomas Hensrud Gulla 1

I want to try HTTP/3 on my website running .NET6 in Azure.
How can I enable this on the WebApp?

Also, in my code - what portnumer should I put here for when the site in running in Azure?

.ConfigureKestrel((context, options) =>
{
options.ListenAnyIP(5001, listenOptions =>
{
listenOptions.Protocols = HttpProtocols.Http1AndHttp2AndHttp3;
listenOptions.UseHttps();
});
});

1 answer

Takahito Iwasa 4,851 Reputation points MVP

2022-05-29T22:18:52.277+00:00

Hi, @Tomas Hensrud Gulla

You cannot enable it in Azure Web Apps.
The App Service's internal load balancer needs to support HTTP/3, but it doesn't.

If you want to use HTTP/3 with .NET 6 in Azure, you probably need to host it in a virtual machine at this point.

Since Azure Load Balancer supports UDP, it may be used as an HTTP/3 load balancer.

https://learn.microsoft.com/en-us/azure/load-balancer/concepts

In .NET Core, the implementation is as follows.

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/servers/kestrel/http3?view=aspnetcore-6.0
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Tomas Hensrud Gulla 1 Reputation point

2022-05-30T10:07:48.603+00:00

Do you have any documentation on how to set up a Linux VM to host a .NET WebApp?

The documentation only contains documentation on how to set up a Windows VM for .NET, I think:
https://learn.microsoft.com/en-us/azure-stack/user/azure-stack-dev-start-howto-vm-dotnet?view=azs-2108

Tomas Hensrud Gulla 1 Reputation point

2022-05-30T10:08:38.057+00:00

Also, any timeframe on when Azure WebApp will support HTTP/3?

VenkateshDodda-MSFT 23,686 Reputation points Microsoft Employee

2022-05-31T06:54:07.16+00:00

@TomasHensrudGulla, Thanks for your response. You can refer to blog post to host your Asp.Net web application on azure Linux virtual machine. I have checked with the Web Apps team internally and they have confirmed that currently they haven't planned to support HTTP/3 on azure webapps. I would suggest you raise a feature request on our Azure webapps Feedback page. So that other users who are in need of a similar feature can upvote it and the product team will take it forward accordingly.

Disclaimer: This response contains a reference to a third-party World Wide Web site. Microsoft is providing this information as a convenience to you. Microsoft does not control these sites and has not tested any software or information found on these sites; therefore, Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. There are inherent dangers in the use of any software found on the Internet, and Microsoft cautions you to make sure that you completely understand the risk before retrieving any software from the Internet.
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Enable HTTP/3 in Azure WebApp running .NET6 on Linux

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