string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%8D%E8%B4%B9%E8%90%A5%E9%94%80%E6%A1%88%E4%BE%8B%E6%9C%80%E6%96%B0 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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