string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BE%B7%E9%82%A6%E7%89%A9%E6%B5%81%E5%92%8B%E6%A0%B7%E6%94%B6%E8%B4%B9 => Failed to connect to 14.18.117.71 port 38069: Connection refused"
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