Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Amazon.DynamoDBv2;
using ApiProject.Controllers;
using AutoMapper;
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.Logging;
using Microsoft.Extensions.Options;

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

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
            services.AddMvc(options =>
            {
                options.FormatterMappings.SetMediaTypeMappingForFormat("xml", "application/xml");
                options.FormatterMappings.SetMediaTypeMappingForFormat("js", "application/json");

            }).AddXmlSerializerFormatters();
            services.AddDefaultAWSOptions(Configuration.GetAWSOptions());
            services.AddAWSService<IAmazonDynamoDB>(); 
            services.AddAutoMapper();
            services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc("v1", new Swashbuckle.AspNetCore.Swagger.Info { Title = "ApiProject", Version = "V1" });
            });
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            app.UseMiddleware<OptionsMiddleware>();
            app.UseStaticFiles();
           
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseHsts();
            }
            app.UseHttpsRedirection();
            app.UseMvc();
            app.UseSwagger();
            app.UseSwaggerUI(c =>
            {
                c.SwaggerEndpoint("/swagger/v1/swagger.json", "ApiProject");
            });
        }
    }
}