Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using CoreApi.Models;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Swashbuckle.AspNetCore.Swagger;

namespace core_api {
    public class Startup {
        public Startup (IConfiguration configuration) {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices (IServiceCollection services) {

            services.AddDbContext<CoreApiContext> (opt => opt.UseInMemoryDatabase ("Employee"));
            services.AddMvcCore().AddApiExplorer().AddAuthorization().AddJsonFormatters();

            services.AddAuthentication("Bearer")
            .AddIdentityServerAuthentication(options => {
                options.Authority = "http://localhost:5000";
                options.RequireHttpsMetadata = false;
                options.ApiName = "api1";
            });

            // Register the Swagger generator, defining one or more Swagger documents
            services.AddSwaggerGen (c => {
                c.SwaggerDoc ("v1", new Info { Title = "My API", Version = "v1" });
            });
        }

        // 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 ();
            }

            // Enable middleware to serve generated Swagger as a JSON endpoint.
            app.UseSwagger ();

            // Enable middleware to serve swagger-ui (HTML, JS, CSS, etc.), specifying the Swagger JSON endpoint.
            app.UseSwaggerUI (c => {
                c.SwaggerEndpoint ("/swagger/v1/swagger.json", "My API V1");
            });

            app.UseAuthentication();
            app.UseMvc ();
        }
    }
}