string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%B3%E9%94%AE%E8%AF%8D%E6%9F%A5%E5%87%86%E7%8E%87%E9%AB%98%E5%90%97 => Failed to connect to 125.88.227.171 port 38114: Connection refused"
关键词查准率高吗
