string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%AF%94%E8%BE%83%E9%9A%BE%E8%AE%B0%E7%9A%846%E4%BD%8D%E6%95%B0%E5%AD%97%E5%AF%86%E7%A0%81 => Received HTTP code 403 from proxy after CONNECT"
比较难记的6位数字密码
