<PackageReference Include="System.ServiceModel.Http" Version="8.1.2" />

System.ServiceModel.Channels.HttpChannelUtilities

static class HttpChannelUtilities
public static Exception ConvertHttpRequestException(HttpRequestException exception, HttpRequestMessage request, HttpAbortReason abortReason)

public static Task<ValueTuple<NetworkCredential, TokenImpersonationLevel, AuthenticationLevel>> GetCredentialAsync(AuthenticationSchemes authenticationScheme, SecurityTokenProviderContainer credentialProvider, TimeSpan timeout)

public static HttpResponseMessage ProcessGetResponseWebException(HttpRequestException requestException, HttpRequestMessage request, HttpAbortReason abortReason)