Caching requires IDistributedCache

If I try to turn on caching in the configuration I get the following error message

Caching is enabled, but no IDistributedCache is found in the services collection

Here’s the configuration:

public void ConfigureServices(IServiceCollection services) {
    services.AddAuthentication(OAuth2IntrospectionDefaults.AuthenticationScheme)
        .AddOAuth2Introspection(options => {
            options.Authority = "https://myidentityserver";
            options.ClientId = "myapi";
            options.ClientSecret = "myapisecret";
            options.EnableCaching = true;
        });

    services.AddControllers();
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env) {
    app.UseRouting();
    app.UseAuthentication();
    app.UseAuthorization();
    app.UseEndpoints(endpoints => {
        endpoints.MapControllers();
    });
}

I don’t have my own IDistributedCache, so shouldn’t there be some default implementation that IdentityModel uses if it doesn’t find one in the DI container?

IdentityModel.AspNetCore.OAuth2Introspection version 4.0.1

[fanc-mso]

Just for reference, to help anybody else out, as I stumbled upon the same:

In Asp.net Core 2.2 you probably called services.AddMvc() in Startup, which itself adds DistributedMemoryCache implicitely.

In Asp.net Core 3.x, if you call only services.AddControllers(), the cache is not added by default. You have to add it explicitely, like by calling services.AddDistributedMemoryCache().

Hope that helps

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