dcomartin/OwinMiddleware.cs

## OwinMiddleware.cs
app.Use(async (context, next) =>
{
    // Add Header
    context.Response.Headers["Product"] = "Web Api Self Host";

    // Call next middleware
    await next.Invoke();
});
	app.Use(async (context, next) =>
	{
	// Add Header
	context.Response.Headers["Product"] = "Web Api Self Host";

	// Call next middleware
	await next.Invoke();
	});