Create an AppFunc for a WebApi application

gistfile1.cs

public static Func<IDictionary<string, object>, Task> CreateWebApiAppFunc(HttpConfiguration config)
        {
            var app = new HttpServer(config);
            var options = new HttpMessageHandlerOptions()
            {
                MessageHandler = app,
                BufferPolicySelector = new OwinBufferPolicySelector(),
                ExceptionLogger = new WebApiExceptionLogger(),
                ExceptionHandler = new WebApiExceptionHandler()
            };
            var handler = new HttpMessageHandlerAdapter(null, options);
            return (env) => handler.Invoke(new OwinContext(env));
        }