Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Configuration;
using Halcyon.Web.HAL.Json;
using Microsoft.AspNetCore.Mvc.Formatters;
using CustomerOrdersApi.Config;
using MongoDB.Bson.Serialization.Conventions;

namespace CustomerOrdersApi
{
    public class Startup
    {
        public IConfigurationRoot Configuration { get; set; }

        public Startup(IHostingEnvironment env)
        {
            // Set up configuration sources.
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
                .AddEnvironmentVariables();

            var pack = new ConventionPack();
            pack.Add(new CamelCaseElementNameConvention());
            ConventionRegistry.Register("camel case", pack, t => true);

            Configuration = builder.Build();
        }

        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            var outputSettings = JsonSerializerSettingsProvider.CreateSerializerSettings();

            services
                .AddOptions()
                .Configure<AppSettings>(Configuration)
                .AddMvc()
                .AddMvcOptions(c => {
                    c.OutputFormatters.Add(new JsonHalOutputFormatter(
                        outputSettings,
                        halJsonMediaTypes: new string[] { "application/hal+json", "application/vnd.example.hal+json", "application/vnd.example.hal.v1+json" }
                    ));
                });
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            // Adds the console logger with minimum loglevel 'Trace'
            loggerFactory.AddConsole(LogLevel.Trace);

            app.UseMvc();

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.Run(async (context) =>
            {
                await context.Response.WriteAsync("Hello World!");
            });
        }
    }
}