string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%BA%E6%89%8D%E5%88%86%E7%B1%BB%E8%AF%84%E4%BB%B7%E4%BD%93%E7%B3%BB => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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