string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B6%88%E9%98%B2%E7%BD%91%E4%B8%8A%E6%8A%A5%E5%90%8D%E6%97%B6%E9%97%B4 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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