Connectster.Shopify.ShopifyCommunicator.ShopifyGet C# (CSharp) Méthode

        private XmlDocument ShopifyGet(string path, string storePassword)
        {
            if (path == null || storePassword == null)
            {
                Logger.Warn("ShopifyCommunicator::ShopifyGet(): Was passed a null path or storePassword, failing.");
                return null;
            }

            //create XmlUrlResover so we can use authentication
            var urlResolver = new XmlUrlResolver();
            var cCache = new CredentialCache
                             {{new Uri(path), "Basic", new NetworkCredential(_appAuth.User, storePassword)}};
            //path = path.Replace("http://", "http://" + appAuth.User + ":" + storePassword + "@");
            urlResolver.Credentials = cCache;

            //Settings for the XmlReader
            var settings = new XmlReaderSettings {XmlResolver = urlResolver};

            var xDoc = new XmlDocument();

            //Try to create the connection, create our Reader
            try
            {
                ApiLogger.DebugFormat("ShopifyCommunicator:: ShopifyGet(): Attempting HTTP GET path={0}", path);
                XmlReader xRead = XmlReader.Create(path, settings);
                xDoc.Load(xRead);
                xRead.Close();
                ApiLogger.DebugFormat("ShopifyCommunicator:: ShopifyGet(): Success: HTTP GET path={0} .", path);

                return CleanupXmlForDeserialization(xDoc);
            }
            catch (WebException web)
            {
                //Log the exception
                Logger.Error("ShopifyCommunicator::ShopifyGet() web exception: " + web.Message + " " + web.Response);
                if (web.Response != null)
                {
                    if (web.Response.Headers.AllKeys.Contains("Status"))
                    {
                        if (web.Response.Headers["Status"] == "401")
                        {
                            Logger.ErrorFormat(
                                "ShopifyCommunicator::ShopifyGet(): Invalid authenitcation tokens for path ={0}", path);
                        }
                        else if (web.Response.Headers["Status"] == "404")
                        {
                            Logger.ErrorFormat("ShopifyCommunicator::ShopifyGet(): Couldnt GET from path ={0}", path);
                        }
                    }

                    Stream wResponse = web.Response.GetResponseStream();
                    var reader = new StreamReader(wResponse);
                    string responseMessage = reader.ReadToEnd();
                    reader.Close();

                    Logger.ErrorFormat("ShopifyCommunicator::ShopifyGet() web exception, Shopify's Response is: {0} ",
                                       responseMessage);
                    return IsValidXml(responseMessage); //returns XmlDocument if valid error, or null.
                }
            }

            Logger.Warn("ShopifyCommunicator:: ShopifyGet() is returning null XmlDocument");
            return null;
        }