BackchannelHttpHandler issue repro project

This project serves as a repro project for an issue with OIDC running behind a corporate proxy.

How to use

Set the correct AzureAD settings under the AzureAD section of the config
Run a proxy that can tracks calls (fiddler is perfect, be sure to disable Act as a system proxy on startup)
At Program.cs:37 you will find a commented line. Comment\Uncomment this line to see the different behaviour.

When authenticating a user...

... without using HttpClient.DefaultProxy, you will see 2 calls in fiddler:
- /<tenant-id>/v2.0/.well-known/openid-configuration
- /<tenant-id>/discovery/v2.0/keys
... while using HttpClient.DefaultProxy you will see 4 calls in fiddler:
- /<tenant-id>/v2.0/.well-known/openid-configuration
- /<tenant-id>/discovery/v2.0/keys
- /common/discovery/instance?....
- /<tenant-id>/oauth2/v2.0/token

This means that setting the proxy on BackchannelHttpHandler is not sufficient when using OIDC behind corporate proxy.

Name		Name	Last commit message	Last commit date
Latest commit History 2 Commits
.idea/.idea.BackchannelHttpHandlerIssue.dir/.idea		.idea/.idea.BackchannelHttpHandlerIssue.dir/.idea
Data		Data
Pages		Pages
Properties		Properties
Shared		Shared
wwwroot		wwwroot
.gitignore		.gitignore
App.razor		App.razor
BackchannelHttpHandlerIssue.csproj		BackchannelHttpHandlerIssue.csproj
Program.cs		Program.cs
README.md		README.md
_Imports.razor		_Imports.razor
appsettings.json		appsettings.json