sample app demon using owin extension methods and fluent api

A.cs

var app = new List<Func<AppFunc, AppFunc>>();

app
	.Use(Favicon.Middleware())
	.Use(IeEdgeChromeFrameHeader.Middleware())
	.Use(RemovePoweredBy.Middleware())
	.Use(CrossDomainRules.Middleware())
	.Use(QueryParser.Middleware())
	.Use(JsonBodyParser.Middleware())
	.Use(UrlEncoded.Middleware())
	.Use(MethodOverride.Middleware())

	.UriTemplateRoute()
		.Configure
			["/owin"]
				.Cache(c => c.MaxAge = 86400)
				.Cache(c => c.Public = true)

				["/environment"]
					.Application(new EnvironmentApplication())
					.End

					["/uri"]
						.Application(new EnvironmentUriApplication())
						.End

					["/headers"]
						.Application(new EnvironmentRequestHeaders())
						.End
				.End

				["/sample"]
					.Get(new ShowFormSample())
					.Post(new HandleFormSubmit())

			["/scripts"]
				.Cache(c => c.MaxAge = 86400)
				.Cache(c => c.Public = true)
				.Files("scripts")
				.End

			["/styles"]
				.Cache(c => c.MaxAge = 86400)
				.Cache(c => c.Public = true)
				.Files("scripts")
				.End

return app.ToOwinApp()

B.cs

app
     .RegexRouter()
     ["hello"]
        .Use(CrossDomainRules.Middleware())
        .Use(RemovePoweredBy.Middleware())
        .Get
            .Use(next =>
                async env =>
                {
                    await env
                        .GetOwinResponseBody()
                        .WriteStringAsync("Hello world - GET");
                })
            .End
        .All
            .Use(MethodOverride.Middleware())
            .Use(next =>
                async env =>
                {
                    await env
                        .GetOwinResponseBody()
                        .WriteStringAsync("hello world");
                })
            .End
        .End
    ["*"]
        .All
            .Use(next =>
                async env => {
                    await env
                        .SetOwinResponseStatusCode(404)
                        .GetOwinResponseBody()
                        .WriteStringAsync("not found");
                })
            .End
        .End
     .Unwrap(); // or .End (if using .End you will have to assign it to some variable due to c# limitations)