string(267) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=ex%E8%A1%A8%E6%A0%BC%E4%BF%9D%E5%AD%98%E5%90%8E%E8%BF%98%E6%98%AF%E5%8E%9F%E6%9D%A5%E5%86%85%E5%AE%B9 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
ex表格保存后还是原来内容
