string(259) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=u%E7%9B%98%E4%B8%8B%E8%BD%BD%E7%94%A8%E4%BB%80%E4%B9%88%E6%A0%BC%E5%BC%8F%E6%9C%80%E5%A5%BD => Failed to connect to 101.89.143.195 port 38109: Connection refused"
u盘下载用什么格式最好
