string(250) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AD%E5%9B%BD37%E7%A0%81%E7%9B%B8%E5%BD%93%E4%BA%8E%E7%BE%8E%E5%9B%BD%E5%A4%9A%E5%B0%91%E7%A0%81 => Received HTTP code 403 from proxy after CONNECT"
中国37码相当于美国多少码
