string(258) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%98%90%E8%BF%B0%E4%BA%92%E8%81%94%E7%BD%91%E7%9A%84%E5%8F%91%E5%B1%95%E8%BF%87%E7%A8%8B => Failed to connect to 101.89.143.195 port 38175: Connection refused"
阐述互联网的发展过程
