string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E5%BB%BA%E7%AE%A1%E7%90%86%E7%AD%94%E6%A1%88%E6%9C%80%E6%96%B0 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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