Serving one static file with router

[michal-minich]

Currently there is staticTemplate for serving one .dt file, but functionality for routing to specific other static file is missing. Only multiple files can be routed with serveStaticFiles but they must correspond to physical layout. I implemented simple function (in text below) for serving static file with router. It is extremely basic, and repurposing serveStaticFiles for this functionality would be better. (but this works for very simple use case)

static this()
{
    auto router = new UrlRouter;
    router
        .get("/", staticFile("views\\index.html", "text/html; charset=UTF-8"))
        .get("*", serveStaticFiles("./public/"));

    auto settings = new HttpServerSettings;
    settings.port = 777;

    listenHttp(settings, router);
}

HTTPServerRequestDelegate staticFile(string path, string contentType)
{
    return (HTTPServerRequest req, HTTPServerResponse res){
        auto fil = openFile(path);
        scope(exit) fil.close();
                res.contentType = contentType;
        res.bodyWriter.write(fil);
    };
}