我正在使用下面的代碼通過(guò) WebRequest 從我的 C# 代碼進(jìn)行 API 調(diào)用：public object GetData() { object response = ""; string token = "EF232354"; string baseUrl = ConfigurationManager.AppSettings["BaseURL"].ToString(); string endPoint = ConfigurationManager.AppSettings["EndPoint"].ToString(); var httpWebRequest = (HttpWebRequest) WebRequest.Create(baseUrl + endPoint); httpWebRequest.ContentType = "application/json"; httpWebRequest.Method = HttpVerb.GET.ToString(); httpWebRequest.Headers.Add("token", token); var httpResponse = (HttpWebResponse) httpWebRequest.GetResponse(); Stream dataStream = httpResponse.GetResponseStream(); StreamReader reader = new StreamReader(dataStream); using(JsonReader sdr = new JsonTextReader(reader))  {  JsonSerializer serializer = new JsonSerializer();  response = serializer.Deserialize(sdr); }  return response;}有時(shí)我會(huì)得到：消息：遠(yuǎn)程服務(wù)器返回錯(cuò)誤：（504）網(wǎng)關(guān)超時(shí)。異常類型：System.Net.WebExceptionWebRequest 一次可以發(fā)出多少個(gè)請(qǐng)求？