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IdentityModel - DiscoveryClient is obsolete

In one of our applications we had the following code to fetch a ClientCredentials token from IdentityServer. This access token could then be used to call another API from our backend:

After updating the IdentityModel NuGet package to the latest version, we got the following warnings:

'DiscoveryClient' is obsolete: 'This type will be deprecated or changed in a future version. It is recommended that you switch to the new extension methods for HttpClient. They give you much more control over the HttpClient lifetime and configuration. See the docs here: https://identitymodel.readthedocs.io'

'TokenClient' is obsolete: 'This type will be deprecated or changed in a future version. It is recommended that you switch to the new extension methods for HttpClient. They give you much more control over the HttpClient lifetime and configuration. See the docs here: https://identitymodel.readthedocs.io'

The current code is using it’s own HttpClient instances and as you probably already know there were some problems with the HttpClient. These are fixed in ASP.NET Core 2.2 and therefore the IdentityModel team decided to update their API’s.

Let’s get rid of these warnings by using the newly available extension methods:

More information: https://leastprivilege.com/2018/06/18/making-the-identitymodel-client-libraries-httpclientfactory-friendly/

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