how to implement url rewriting similar to SO

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This is called a slug route. One way to achieve this is to define a route with an optional slug parameter, and in the controller method check if the parameter has been provided

routes.MapRoute(
    name: "Question",
    url: "Question/{id}/{slug}",
    defaults: new { controller = "Question", action = "Details", slug = UrlParameter.Optional }
);

Then in QuestionController (assumes an id will always be provided)

public ActionResult Details (int id, string slug)
{
    if (string.IsNullOrEmpty(slug))
    {
        // Look up the slug in the database based on the id, but for testing
        slug = "this-is-a-slug";
        return RedirectToAction("Details", new { id = id, slug = slug });
    }
    var model = db.Questions.Find(id);
    return View(model);
}

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