string(294) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8A%96%E9%9F%B3%E9%87%8C%E9%9D%A2%E7%9A%84%E6%B8%85%E7%90%86%E7%BC%93%E5%AD%98%E6%98%AF%E4%BB%80%E4%B9%88%E7%94%A8%E7%9A%84 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
抖音里面的清理缓存是什么用的
