Change to not actually resolve the IProvideIdentityDetails service, a…

…s it is possibly not fully wired and ready to start up.

Instead, use the IServiceProviderIsService interface to see if IProvideIdentityDetails has been registered as a type in the service provider (which AddIdentityProvider will do, if appropriate).

Source/DotNET/Applications/Identity/IdentityProviderEndpointExtensions.cs

@@ -42,11 +42,13 @@ public static IServiceCollection AddIdentityProvider(this IServiceCollection ser
     /// <exception cref="MultipleIdentityDetailsProvidersFound">Thrown if multiple identity details providers are found.</exception>
     public static IEndpointRouteBuilder MapIdentityProvider(this IEndpointRouteBuilder endpoints, IApplicationBuilder app)
     {
-        var identityProvider = app.ApplicationServices.GetService<IProvideIdentityDetails>();
-        if (identityProvider is not null)
+        var serviceProviderIsService = app.ApplicationServices.GetService<IServiceProviderIsService>();
+        if (serviceProviderIsService!.IsService(typeof(IProvideIdentityDetails)))
         {
-            endpoints.MapGet(".aksio/me", async (HttpRequest request, HttpResponse response) =>
-                await app.ApplicationServices.GetService<IdentityProviderEndpoint>()!.Handler(request, response));
+            endpoints.MapGet(
+                ".aksio/me",
+                (HttpRequest request, HttpResponse response) =>
+                    app.ApplicationServices.GetService<IdentityProviderEndpoint>()!.Handler(request, response));
         }
 
         return endpoints;