string(252) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E4%BC%9A%E4%BC%9A%E8%AE%A1%E8%BD%BB%E4%B8%80706%E9%A1%B5%E7%AC%AC4%E9%97%AE%E8%A7%A3%E7%AD%94 => Received HTTP code 403 from proxy after CONNECT"
注会会计轻一706页第4问解答
