string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%97%B2%E9%B1%BC%E6%80%8E%E4%B9%88%E4%BB%98%E6%AC%BE%E4%BA%A4%E6%98%93 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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