AppleReceiptVerifier.AppleHttpRequest.GetResponse C# (CSharp) Méthode

        public string GetResponse(Uri url, string postData)
        {
            string response = string.Empty;

            try
            {
                WebRequest webRequest = WebRequest.Create(url);
                webRequest.ContentType = "text/plain";
                webRequest.Method = "POST";

                using (var streamWriter = new StreamWriter(webRequest.GetRequestStream()))
                {
                    streamWriter.Write(postData);
                    streamWriter.Flush();
                    streamWriter.Close();
                }

                WebResponse webResponse = webRequest.GetResponse();
                using (var streamReader = new StreamReader(webResponse.GetResponseStream()))
                {
                    response = streamReader.ReadToEnd();
                    streamReader.Close();
                }
            }
            catch
            {
            }

            return response;
        }