string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A6%82%E4%BD%95%E5%BE%97%E5%88%B0%E4%BA%AC%E4%B8%9C%E5%BF%85%E8%B4%AD%E7%A0%81 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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