string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%8E%8B%E4%B8%9C%E5%85%B4%E8%80%81%E5%B8%88%E8%AF%BE%E7%A8%8B%E8%A7%A3%E8%AF%BB => Failed to connect to 101.89.159.206 port 38187: Connection refused"
王东兴老师课程解读
