[Bug] Can not call discovery and retrieve metadata via HTTP/2 any more

[nfarrokhi]

Which version of Microsoft.IdentityModel are you using?
6.15.1

Where is the issue?

• M.IM.Protocols

Is this a new or an existing app?

a. The app exists and I have upgraded to a new version of Microsoft.IdentityModel.* I got new version after updating Microsoft.AspNetCore.Authentication.JwtBearer to v 7.0.0

Repro

Try to expose discovery endpoint, which only works on HTTP/2

Expected behavior
Being able to call discovery endpoint and get metadata using HTTP/2

Actual behavior

Call to discovery endpoint to get metadata is only done via HTTP/1.1

Possible solution

Change the code on https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/blob/dev/src/Microsoft.IdentityModel.Protocols/Configuration/HttpDocumentRetriever.cs#L123 using one of these solutions:

1. Set httpRequest.Version to httpClient.DefaultRequestVersion.
2. Provide an option/setting to be able to set the httpRequest.Version
3. Revert back HttpDocumentRetriever code to use HttpClient.GetAsync

[brentschmaltz]

@nfarrokhi I understand 1 and 2, but am not following 3.
Can you help us out?

[prochnowc]

I've created PR #2809 to address this problem, also mentioned in #2808