public void ConfigureServices(IServiceCollection services) {
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

        services.AddMvcCore().AddAuthorization().AddJsonFormatters();

        services.AddAuthentication("Bearer")
            .AddIdentityServerAuthentication(options => {
                options.Authority = "http://localhost:5000"; //Identity Server URL
                options.RequireHttpsMetadata = false; // make it false since we are not using https
                options.ApiName = "Api_Name"; //api name which should be registered in IdentityServer
            });
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env) {
        if (env.IsDevelopment()) {
            app.UseDeveloperExceptionPage();
        }
        else {
            app.UseHsts();
        }

        app.UseAuthentication();

        app.UseHttpsRedirection();
        app.UseMvc();
    }

var identityServer = await DiscoveryClient.GetAsync("http://localhost:5000"); //discover the IdentityServer
        if (identityServer.IsError) {
            Console.Write(identityServer.Error);
            return;
        }

        HttpClient client = new HttpClient();

        var tokenResponse = await client.RequestPasswordTokenAsync(new PasswordTokenRequest {
            Address = identityServer.TokenEndpoint,
            ClientId = "Api_Client",
            ClientSecret = "secret",

            UserName = "Majd",
            Password = "P@ssw0rd@123"
        });

        if (tokenResponse.IsError) {
            Console.WriteLine(tokenResponse.Error);
            return;
        }

        //Call the API

        client.SetBearerToken(tokenResponse.AccessToken);

        var response = await client.GetAsync("https://localhost:44368/api/values");
        var response2 = await client.GetAsync("https://localhost:44368/api/values/1");
        var content = await response.Content.ReadAsStringAsync();
        Console.WriteLine(JArray.Parse(content));
        Console.ReadKey();