Log body of requests in ServiceStack using attribute

RequstDataSpyAttribute.cs

public class RequestDataSpyAttribute : RequestFilterAttribute
{
    // gets injected by ServiceStack
    public ILog Log { get; set; }

    private readonly string _logMessage;

    public RequestDataSpyAttribute(string logMessage)
    {
        _logMessage = logMessage;
    }

    public override void Execute(IRequest req, IResponse res, object requestDto)
    {
        System.Web.HttpRequestWrapper original = req.OriginalRequest as System.Web.HttpRequestWrapper;
        if (original == null)
            return;

        Log.Debug($"{_logMessage} Request: {original.InputStream.ReadToEnd()}");
    }
}