Hi,

For a multilingual and multidomain EPiServer 7.5 CMS website (version 7.19.2.0), I have an issue with resolving canonical URLs for content pages.

I would like to enforce that visitors to be redirected to the canonical URL of an EPiServer page.

To accomplice this I have an IInitializableHttpModule which is responsible for resolving the URL and redirecting the browser.

However, visitors do not always get redirected to the right URL.

Our setup:

[host].com/[url]/?[query] should HTTP 301 redirect to [host].com/en/[url]/?[query]
[host].be/[url]/?[query] should HTTP 301 redirect to [host].com/be/[url]/?[query]
[host].nl/[url]/?[query] should HTTP 301 redirect to [host].com/nl/[url]/?[query]

The issue:

In some cases when I request http://[host].nl/ I get redirected to http://[host].com/en/ instead of http://[host].com/nl/.

This seems to be caused by Global.UrlRewriteProvider.ConvertToExternal setting the language to English as instead of Dutch.

[InitializableModule]
    [ModuleDependency(typeof(InitializationModule))]
    public class RequestHandlerInitialization : IInitializableHttpModule
    {
        private static readonly ILog Logger = LogManager.GetLogger(typeof(RequestHandlerInitialization));

        public void Initialize(InitializationEngine context)
        {
        }

        public void InitializeHttpEvents(HttpApplication application)
        {
            application.BeginRequest += BeginRequest;
        }

        public void Uninitialize(InitializationEngine context)
        {
        }

        public void Preload(string[] parameters)
        {
        }

        private bool ShouldRedirect(string correctUrl, string urlWithoutQuery)
        {
            return correctUrl != urlWithoutQuery;
        }

        private string GetCorrectUrl(UrlBuilder url)
        {
            return url.Uri.IsAbsoluteUri ? url.Uri.AbsoluteUri : url.Uri.OriginalString;
        }

        private void BeginRequest(object sender, EventArgs e)
        {
            try
            {
                HttpContext context = HttpContext.Current;

                string browserUrl = context.Request.Url.ToString();
                UrlBuilder url = new UrlBuilder(context.Request.Url);

                object contentReference;
                Global.UrlRewriteProvider.ConvertToInternal(url, out contentReference);

                // Only redirect for ContentReferences
                if (contentReference is ContentReference)
                {
                    Global.UrlRewriteProvider.ConvertToExternal(url, null, System.Text.Encoding.UTF8);
                    var correctUrl = GetCorrectUrl(url);

                    if (ShouldRedirect(correctUrl, browserUrl))
                    {
                        context.Response.RedirectPermanent(correctUrl, true);
                    }
                }
            }
            catch (Exception ex)
            {
                Logger.Error("Could not rewrite or check URL", ex);
            }
        }
    }

Does anyone have any clues on what can be done to fix this?