string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%BE%BD%E5%AE%81%E6%B3%A8%E4%BC%9A%E6%8A%A5%E5%90%8D%E7%BD%91%E7%AB%99 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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