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How to force lowercase URLs in ASP.NET 5

Learn how to force ASP.NET MVC to generate lower-case URLs on all generated links

Posted on Wednesday, November 18, 2015 at 2:23 AM into csharp code seo by Steve Woods

One of the most annoying things about ASP.NET development is that the Routing components default to being in CamelCase so you end up with URLs like /About/Index instead of /about/index.

In terms of SEO, a URL is classed as distinct based on its case, so the first and second URL are treated as two pages even though they share the same content - this can have a detrimental effect on your page ranking in Google because it classes one of the URLs as duplicate content.

Besides, it's always nice to have consistency in a web app and since the rest of the world seems to default to lowercase (and it looks better) t's a good idea to make it the default setting for your application.

You can of course use redirects in IIS to automatically do this, but that usually involves a 301 redirect which can be fairly expensive if you have a high-traffic website.

Here's a simple solution that works for all generated URLs in ASP.NET Routing, for instance those generated using Tag Helpers, i.e.:

@Html.ActionLink("Home", "Index", "Click Me")

will output:

<a href="/home/index">Click Me</a>

For ASP.NET 5

Add the following to startup.cs in the ConfigureServices() method:

    services.ConfigureRouting(routeOptions =>
    {
        routeOptions.LowercaseUrls = true;
    });

For ASP.NET 4

Add the following to your RegisterRoutes() method in your RouteConfig Class

routes.LowercaseUrls = true;

I hope you find this useful!

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