string(294) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%88%90%E9%83%BD%E5%B8%82%E7%9F%B3%E5%AE%A4%E4%B8%AD%E5%AD%A6%E5%AD%A6%E8%B4%B9%E4%B8%80%E5%B9%B4%E5%A4%9A%E5%B0%91%E5%85%83 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
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