string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%86%85%E7%A7%91%E4%B8%BB%E6%B2%BB%E5%8C%BB%E5%B8%88%E7%AD%94%E6%A1%88 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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