string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%AE%80%E5%8D%95%E7%9F%A5%E8%AF%86%E7%82%B9 => Failed to connect to 101.89.159.206 port 38087: Connection refused"
计算机简单知识点
