Question

I am trying to store the url in a Session to be picked up later when I redirect the Response to tidy up my URL. This is in the Global.asax file. I am taking the original response and storing the url in a session

    protected void Application_Error(object sender, EventArgs e)
    {
        Exception exception = Server.GetLastError();
        HttpException httpException = exception as HttpException;

        // get the url
        var url = Request.RawUrl;

        // store in session
        Session["requestUrl"] = url;

        if (exception is HttpException && ((HttpException)exception).GetHttpCode() == 404) {
            Response.Redirect("/CMS/CMS");
        }

    }

If I look at the Session contents it is in there

I then try to extract this in my CMS/CMS Action but the variable url is null??:

    public ActionResult CMS(String aspxerrorpath)
    {
        var url = Session["requestUrl"]; // this is null??

        Response.StatusCode = 404;
        Response.TrySkipIisCustomErrors = true;
        return View();
    }

Any Ideas?

Answer 1

Sorry I have no idea why the session is not working but if you want to tidy your urls then rewrite the path, don’t redirect:

protected void Application_Error(object sender, EventArgs e)
{
    var exception = Server.GetLastError();
    var httpException = exception as HttpException;

    if (exception is HttpException && ((HttpException)exception).GetHttpCode() == 404) 
    {
        Server.ClearError();

        // get the url
        var url = Request.RawUrl;

        var routeData = new RouteData();
        routeData.Values["controller"] = "Cms";
        routeData.Values["action"] = "Cms";
        routeData.Values["aspxerrorpath"] = url;

        IController cmsController = new CmsController();
        var rc = new RequestContext(new HttpContextWrapper(Context), routeData);
        cmsController.Execute(rc);
    }
}

This way you don’t need to perform an additional redirect and you don’t need to be relying on Session.

You might also checkout the following post from where I borrowed the code.