string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=u%E7%9B%98%E6%A0%BC%E4%BB%80%E4%B9%88%E6%A0%BC%E5%BC%8F%E5%A5%BD => Failed to connect to 14.18.117.71 port 38133: Connection refused"
u盘格什么格式好
