ServiceStack.HttpRequestExtensions.InferBaseUrl C# (CSharp) Метод

        public static string InferBaseUrl(this string absoluteUri, string fromPathInfo = null)
        {
            if (IsNullOrEmpty(fromPathInfo))
            {
                fromPathInfo = "/" + (HostContext.Config.HandlerFactoryPath ?? "");
            }
            else
            {
                fromPathInfo = fromPathInfo.TrimEnd('/');
                if (fromPathInfo.Length == 0)
                    return null;
            }

            if (IsNullOrEmpty(absoluteUri))
                return null;

            var pos = absoluteUri.IndexOf(fromPathInfo, "https://".Length + 1, StringComparison.Ordinal);
            return pos >= 0 ? absoluteUri.Substring(0, pos) : absoluteUri;
        }