Servers - IIS - HTTP/3

In this article

• In-process

• Out-of-Process. In Out-of-Process, IIS responds to the client using HTTP/3, but the reverse proxy connection to the Kestrel server uses HTTP/1.1.

• Windows Server 2022 / Windows 11 or later

• An https url binding is used.

• The EnableHttp3 registry key is set.

Alt-Svc

app.Use((context, next) =>
{
    context.Response.Headers.AltSvc = "h3=\":443\"";
    return next(context);
});

Ref: Use ASP.NET Core with HTTP/3 on IIS