string(301) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E5%BB%BA%E7%9C%8B%E8%AF%BE%E4%BB%B6%E5%95%A5%E9%83%BD%E4%BC%9A%E4%B8%80%E5%81%9A%E9%A2%98%E5%95%A5%E9%83%BD%E4%B8%8D%E4%BC%9A => Failed to connect to 14.18.117.71 port 38133: Connection refused"
一建看课件啥都会一做题啥都不会
