Directly from Google: http://support.google.com/webmasters/bin/answer.py?hl=en&answer=139394 Can the link be relative or absolute? rel=”canonical” can be used with relative or absolute links, but we recommend using absolute links to minimize potential confusion or difficulties. If your document specifies a base link, any relative links will be relative to that base link.
With System.Web.Routing 4.5 you may implement this straightforward by setting LowercaseUrls property of RouteCollection: public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute(“{resource}.axd/{*pathInfo}”); routes.LowercaseUrls = true; routes.MapRoute( name: “Default”, url: “{controller}/{action}/{id}”, defaults: new { controller = “Home”, action = “Index”, id = UrlParameter.Optional } ); } Also assuming you are doing this for SEO reasons you want … Read more