string(255) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%80%8E%E4%B9%88%E6%B5%8B%E9%87%8F%E7%BD%91%E9%80%9F%E6%98%AF%E5%A4%9A%E5%B0%91%E5%85%86 => Failed to connect to 14.18.46.51 port 38206: Connection refused"
怎么测量网速是多少兆
