string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BC%A9%E9%87%8F%E5%8F%8C%E5%BA%95%E7%9A%84%E6%A0%B8%E5%BF%83%E6%9D%A1%E4%BB%B6 => Received HTTP code 403 from proxy after CONNECT"
缩量双底的核心条件
