string(248) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%9F%BA%E6%9C%AC%E7%9A%84%E9%80%BB%E8%BE%91%E8%BF%90%E7%AE%97%E5%8C%85%E6%8B%AC%E4%BB%80%E4%B9%88 => Received HTTP code 403 from proxy after CONNECT"
基本的逻辑运算包括什么
