OWIN send static file for multiple routes

Question

I'm making a SPA which sits on top of ASP.Net WebAPI. I'm waiting to use HTML5 history rather than #/ for history routing but that poses a problem for deep linking, I need to make sure / and /foo/bar all return the same HTML file (and my JS will render the right part of the SPA).

How do I get OWIN/Katana to return the same HTML file for multiple different urls?

Answer 1

To make things simple, while still keeping all the caching goodness etc. from the StaticFiles middleware, I'd just rewrite the request path using an inline middleware, like this

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        app.Map("/app", spa =>
        {
            spa.Use((context, next) =>
            {
                context.Request.Path = new PathString("/index.html");

                return next();
            });

            spa.UseStaticFiles();
        });

        app.UseWelcomePage();
    }
}

This will serve the welcome page on anything but /app/*, which will always serve index.html instead.