WebApi调腾讯接口无响应是怎么回事，求大神指教。

[HttpPost]
public object GetCardInfo([FromBody]string files)
{
       try
       {
            Credential cred = new Credential
            {
                SecretId = "xxxx",
                SecretKey = "xxxx"
            };
            ClientProfile clientProfile = new ClientProfile();
            HttpProfile httpProfile = new HttpProfile();
            httpProfile.Endpoint = ("ocr.tencentcloudapi.com");
            clientProfile.HttpProfile = httpProfile;
            OcrClient client = new OcrClient(cred, "ap-guangzhou", clientProfile);
            BusinessCardOCRRequest req = new BusinessCardOCRRequest();
            string strParams = "{\"ImageBase64\":\"" + files + "\"}";
            req = BusinessCardOCRRequest.FromJsonString<BusinessCardOCRRequest>(strParams);
               ** BusinessCardOCRResponse resp = client.BusinessCardOCR(req).ConfigureAwait(false).GetAwaiter().GetResult();**
            return AbstractModel.ToJsonString(resp);

        }
        catch (Exception ex)
        {
            APP_Menber.SaveException(ex.ToString(), "GetCardInfo");
            return ex.ToString();
        }
    }

执行到下面句代码时就停了，也不报异常（控制台程序测试又是正常的）
BusinessCardOCRResponse resp = client.BusinessCardOCR(req).ConfigureAwait(false).GetAwaiter().GetResult();

function ssss(_data) {
            console.log(_data.split(',')[1])
            mui.ajax(api_url + "/api/YDLCRM/Card/GetCardInfo", {
                data: {
                    "": _data.split(',')[1] || ''
                },
                type: "post",
                success: function(data) {
                    alert(1)
                    console.log(JSON.stringify(data));
                },
                error: function(ex, ex1, ex2) {
                    alert(2)
                    console.log(JSON.stringify(ex) + JSON.stringify(ex1) + JSON.stringify(ex2));
                }
            })
        }

看看是不是超时，文字识别是比较慢的。
传一个小一点的图片过去试试看。