OkOwin.IIS 1.0.1

using Microsoft.Owin;
using Microsoft.Owin.Cors;
using Microsoft.Owin.FileSystems;
using Microsoft.Owin.StaticFiles;
using Owin;
using System.Web.Http;

namespace TestOwinIISWebApi
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.UseCors(CorsOptions.AllowAll);

            #region Cors Domain

            //var policy = new CorsPolicy()
            //{
            //    AllowAnyHeader = true,
            //    AllowAnyMethod = true,
            //    SupportsCredentials = true
            //};

            //// list of domains that are allowed can be added here
            //policy.Origins.Add("domain");
            ////be sure to include the port:
            ////example: "http://localhost:8081"

            //app.UseCors(new CorsOptions
            //{
            //    PolicyProvider = new CorsPolicyProvider
            //    {
            //        PolicyResolver = context => Task.FromResult(policy)
            //    }
            //});

            #endregion

            app.MapWhen(context =>
            {
                return context.Request.Path.Value.StartsWith("/people");

            }, builder =>
            {
                builder.Run(async (context) =>
                {
                    await context.Response.WriteAsync("people");

                });
            });

            app.Map("/a/index", builder =>
            {
                builder.Run(async (context) =>
                {
                    await context.Response.WriteAsync("aaaaa");

                });
            });

            app.Map("/b/index", builder =>
            {
                builder.Run(async (context) =>
                {
                    await context.Response.WriteAsync("bbbb");

                });
            });

            //WebApi
            var config = GetWebApiConfig();
            app.UseWebApi(config);

            //wwwroot
            var fileOptions = new FileServerOptions()
            {
                RequestPath = PathString.Empty,
                EnableDefaultFiles = true,
                EnableDirectoryBrowsing = false,
                FileSystem = new PhysicalFileSystem(@".\wwwroot"),
            };
            fileOptions.StaticFileOptions.ServeUnknownFileTypes = true;
            app.UseFileServer(fileOptions);

        }

        private HttpConfiguration GetWebApiConfig()
        {
            HttpConfiguration config = new HttpConfiguration();

            config.MapHttpAttributeRoutes();

            config.Routes.MapHttpRoute(
            name: "Default",
            routeTemplate: "api/{controller}/{action}",
            defaults: new { id = RouteParameter.Optional }
            );

            //config.Formatters.JsonFormatter.MediaTypeMappings.Add(new QueryStringMapping("datatype", "json", "application/json"));

            config.Formatters.Remove(config.Formatters.XmlFormatter);

            config.Formatters.JsonFormatter.SerializerSettings = new Newtonsoft.Json.JsonSerializerSettings()
            {
                NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore
            };

            return config;
        }

    }
}

<?xml version="1.0" encoding="utf-8"?>
<configuration>
	<system.web>
		<compilation debug="true" targetFramework="4.5.2" />
		<httpRuntime targetFramework="4.5.2" />
	</system.web>
	<system.webServer>
		<modules runAllManagedModulesForAllRequests="true">
			<remove name="FormsAuthentication" />
		</modules>
		<handlers>
			<remove name="ExtensionlessUrlHandler-Integrated-4.0" />
			<remove name="OPTIONSVerbHandler" />
			<remove name="TRACEVerbHandler" />
			<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
			<add name="Owin" verb="" path="*" type="Microsoft.Owin.Host.SystemWeb.OwinHttpHandler, Microsoft.Owin.Host.SystemWeb"/>
		</handlers>
	</system.webServer>
	<runtime>
		<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
			<dependentAssembly>
				<assemblyIdentity name="Microsoft.Owin" publicKeyToken="31bf3856ad364e35" culture="neutral" />
				<bindingRedirect oldVersion="0.0.0.0-4.2.2.0" newVersion="4.2.2.0" />
			</dependentAssembly>
		</assemblyBinding>
		<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
			<dependentAssembly>
				<assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
				<bindingRedirect oldVersion="0.0.0.0-13.0.0.0" newVersion="13.0.0.0" />
			</dependentAssembly>
		</assemblyBinding>
	</runtime>
</configuration>