使用官方例子或有敏感词语 调用API的msgSecCheck一直返回成功0 ，请帮看看什么问题。

发送内容（完2347全dfji试3726测asad感3847知qwez到）：

b'{"content": "\\u5b8c2347\\u5168dfji\\u8bd53726\\u6d4basad\\u611f3847\\u77e5qwez\\u5230"}'

返回

{"errcode":0,"errmsg":"ok"}

python代码：

msgcheck_url = 'https://api.weixin.qq.com/wxa/msg_sec_check?access_token='+ACCESS_TOKEN
reqdata = dict()
reqdata['content'] = validcontent
senddata = json.dumps(reqdata)
senddata = bytes(senddata, 'utf8')
req = urlRequest.Request(msgcheck_url,data=senddata,  headers={'Content-Type': 'json'})
result = urlRequest.urlopen(req,timeout=3000).read()
result = result.decode('utf-8')

token: 17_t_wajB86AMkC18kmYecb6z-xwn-X7UkNbmdJIkfrd_SNvm86ZSFjIAqeM-hJCpVT3u5VqgUtvwUF4zzeH02iqvQ2CI_yIfqhWld8tAbGreZ6gYdefBRHeduTmh7KysPfy605S9NpkhE9jmV_KTTaAAARAA