string(233) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=wps%E5%BC%95%E7%94%A8%E5%8F%82%E8%80%83%E6%96%87%E7%8C%AE%E7%9A%84%E6%A0%BC%E5%BC%8F => Received HTTP code 403 from proxy after CONNECT"
wps引用参考文献的格式
