How to Handle URL-Encoded Slashes in ASP.NET Routing?

URL-Encoded Slash in URL

When attempting to access a URL containing an encoded slash (/), such as http://localhost:5000/Home/About/100/200, the default routing configuration may fail to match the route.

One potential solution is to include a catch-all parameter in the URL template, as demonstrated below:

routes.MapRoute(
    "Default",                                                // Route name
    "{controller}/{action}/{*id}",                            // URL with parameters
    new { controller = "Home", action = "Index", id = "" });  // Parameter defaults

This adjustment allows any series of path segments to be captured in the id parameter, including slashes. However, this approach may not be suitable for all scenarios.

Another option, particularly if the encoded slash is part of a single parameter, is to implement custom encoding and decoding logic. This can be accomplished through a custom class like the one provided below:

public class UrlEncoder
{ 
    public string URLDecode(string  decode)
    {
        if (decode == null) return null;
        if (decode.StartsWith("="))
        {
            return FromBase64(decode.TrimStart('='));
        }
        else
        {
            return HttpUtility.UrlDecode( decode) ;
        }
    }

    public string UrlEncode(string encode)
    {
        if (encode == null) return null;
        string encoded = HttpUtility.PathEncode(encode);
        if (encoded.Replace("%20", "") == encode.Replace(" ", ""))
        {
            return encoded;
        }
        else
        {
            return "=" + ToBase64(encode);
        }
    }

    public string ToBase64(string encode)
    {
        Byte[] btByteArray = null;
        UTF8Encoding encoding = new UTF8Encoding();
        btByteArray = encoding.GetBytes(encode);
        string sResult = System.Convert.ToBase64String(btByteArray, 0, btByteArray.Length);
        sResult = sResult.Replace("+", "-").Replace("/", "_");
        return sResult;
    }

    public string FromBase64(string decode)
    {
        decode = decode.Replace("-", "+").Replace("_", "/");
        UTF8Encoding encoding = new UTF8Encoding();
        return encoding.GetString(Convert.FromBase64String(decode));
    }
}

This class allows you to encode and decode strings in a custom manner, ensuring that special characters like slashes are handled correctly while maintaining readability and usability.

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