ServiceStack.HttpRequestExtensions.GetAbsolutePath C# (CSharp) Method

        public static string GetAbsolutePath(this IRequest httpReq)
        {
            var resolvedPathInfo = httpReq.PathInfo;

            var pos = httpReq.RawUrl.IndexOf(resolvedPathInfo, StringComparison.OrdinalIgnoreCase);
            if (pos == -1)
                throw new ArgumentException($"PathInfo '{resolvedPathInfo}' is not in Url '{httpReq.RawUrl}'");

            return httpReq.RawUrl.Substring(0, pos + resolvedPathInfo.Length);
        }