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digitalmars.D.learn - How to check session before access to static page?

void main()
{
     auto router = new URLRouter;
     router.get("/", 
serveStaticFiles("D:\\code\\onlineTest\\index.html"));
     router.get("/admin", 
serveStaticFiles("D:\\code\\onlineTest\\admin.html"));
     router.any("/foo", &foo);

     auto settings = new HTTPServerSettings;
     settings.port = 8080;
     settings.bindAddresses = ["::", "127.0.0.1"];
     settings.sessionStore = new MemorySessionStore; // SESSION
}


void foo(HTTPServerRequest req, HTTPServerResponse res)
{
     if (req.session)
     {
        res.writeBody("Hello, World!", "text/plain");
     }
}

Before showing foo I can check session status. But How to check 
session status for static /admin page?
Dec 03 2015