云函数（Java）报错

客户端请求无参数的Cloud Function “Hello2”返回成功，但是请求有参数的方法时会报错，以下为相关代码
客户端环境：Unity 云函数环境：Java

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//云函数地址
    string url_address = "XXX.engine.lncldapi.com/1.1/functions/";

    public void ReqCloudFunction(string functionName, WWWForm form)
    {
        string url = StringUtil.Concat(url_address, functionName);
        httpHelper.Request(url, form);
    }

using (UnityWebRequest www = UnityWebRequest.Post(url, _postData))
        {
            www.SetRequestHeader("X-LC-Id", "XXXXXXXXXX-XXXXX");
            www.SetRequestHeader("X-LC-Key", "XXXXXXXX");
            www.SetRequestHeader("Content-Type", "application/json; charset=utf-8");
            www.timeout = InfoConst.WebRequestTimeOut;
            AsyncOperation asyncOpe = www.SendWebRequest();

            while (!asyncOpe.isDone)
            {
                yield return Timing.DeltaTime;
            }

            if (CommonFunction.IsUnityWebRequestSuccess(www))
            {
                /.../
                //成功回调(拷贝收到的信息)
                receiveCallBack(cacheData);
            }
             /.../
        }

在zyu帮助下 已使用封装好的接口解决。