Swagger UI setup

Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace WebApi_SwaggerUI
{
    /// <summary>
    /// install-package nswag.aspnetcore
    /// Run web api and access swagger ui : http://localhost:65384/swagger
    /// </summary>
    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.AddControllers();
            services.AddSwaggerDocument(config =>
            {
                config.PostProcess = document =>
                {
                    document.Info.Version = "v1";
                    document.Info.Title = "ToDo API";
                    document.Info.Description = "A simple ASP.NET Core web API";
                    document.Info.TermsOfService = "None";
                    document.Info.Contact = new NSwag.OpenApiContact
                    {
                        Name = "jm",
                        Email = string.Empty,
                        Url = "https://twitter.com/jm"
                    };
                    document.Info.License = new NSwag.OpenApiLicense
                    {
                        Name = "Use under LICX",
                        Url = "https://example.com/license"
                    };
                };
            });
        }

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

            #region swagger

            // URLs: 
            // - http://localhost:65384/swagger/v1/swagger.json
            // - http://localhost:65384/swagger
            // - http://localhost:65384/redoc
            // - http://localhost:65384/openapi
            // - http://localhost:65384/openapi_redoc

            app.UseOpenApi();
            app.UseSwaggerUi3();
            app.UseReDoc();

            #endregion//// Add OpenAPI and Swagger middlewares to serve documents and web UIs

            app.UseHttpsRedirection();

            app.UseRouting();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
        }
    }
}