[Feature Request] Instance discovery should timeout

[bgavrilMS]

MSAL client type

Confidential

Problem statement

1. Setup the SDK to use an Entra authority host that is not known to the SDK, e.g. login.microsoft.new
2. Block access to "login.microsoftonline.com/discovery" endpoint by timing it out
3. Acquire token, e.g. S2S token repeatedly (from cache and from STS)
4. Examine the HTTP traffic

Actual: the SDK will timeout after 100 seconds (default HttpClient timeout)
Expected: the SDK should timeout after a reasonable delay (e.g. 10 seconds) and not attempt instance discovery again. A token should be retrieved.

Related work item: #5804

Proposed solution

No response

Alternatives

No response