Umbraco - an IContentFinder that attempts to find the content by it's ASCII URL. This is useful for if an existing website has switched from non-ASCII URLs.

ContentFinderByAsciiUrl.cs

using System.Linq;
using Umbraco.Core;
using Umbraco.Core.Configuration;
using Umbraco.Core.Logging;
using Umbraco.Web;
using Umbraco.Web.Routing;

namespace Our.Umbraco.Web.Routing.ContentFinders
{
    public class ContentFinderByAsciiUrl : IContentFinder
    {
        public virtual bool TryFindContent(PublishedContentRequest contentRequest)
        {
            if (contentRequest == null)
                return false;

            if (!UmbracoConfig.For.UmbracoSettings().RequestHandler.ConvertUrlsToAscii)
                return false;

            var path = contentRequest.Uri.GetAbsolutePathDecoded();

            // if the URL path only has ASCII (ANSI) characters,
            // then ignore it! (We're only interested in non-ASCII chars)
            if (!path.Any(x => (int)x > 127))
                return false;

            LogHelper.Debug<ContentFinderByAsciiUrl>("TryFindContent({0})", () => contentRequest.Uri.ToString());

            var parts = path.ToDelimitedList("/");

            var asciiPath = string.Concat("/", string.Join("/", parts.Select(x => x.ToUrlSegment())), "/");

            var route = contentRequest.HasDomain
                ? string.Concat(contentRequest.UmbracoDomain.RootContentId, DomainHelper.PathRelativeToDomain(contentRequest.DomainUri, asciiPath))
                : asciiPath;

            var node = contentRequest
                .RoutingContext
                .UmbracoContext
                .ContentCache
                .GetByRoute(route);

            if (node == null)
                return false;

            contentRequest.SetRedirectPermanent(node.Url);

            return true;
        }
    }
}