string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%88%B6%E4%BD%9C%E7%BD%91%E9%A1%B5%E7%9A%84%E4%B8%89%E5%A4%A7%E6%8A%80%E6%9C%AF%E6%98%AF%E5%93%AA%E4%BA%9B => Failed to connect to 14.18.117.71 port 38220: Connection refused"
制作网页的三大技术是哪些
