ajax postman

IIS 调用一个接口返回 502 - Web server received an invalid response while acting as a gateway or proxy server.

  
        public ActionResult  ExecuteThingsOne()
        {
            if (Monitor.TryEnter(objInLock))
            {
                try
                {
                      // 准备数据（耗时约10秒）
                       ......
                    // POST 同步调用接口（耗时约60秒）
                     ......
                   return Content(new Result {Success = true }.ToJson());
                }
                catch (Exception ex)
                {
                       return Content(new Result {Success = false}.ToJson());
                }
                finally
                {
                    Monitor.Exit(objInLock);
                }
            }
            else
            {
                return Content(new Result{Success = false }.ToJson());
            }
        }