string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%B5%84%E9%87%91%E6%89%BE%E5%A4%A7%E9%A1%B9%E7%9B%AE%E5%90%88%E4%BD%9C => Failed to connect to 14.18.117.71 port 38041: Connection refused"
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