string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%89%AA%E8%A7%86%E9%A2%91%E8%BD%AF%E4%BB%B6%E6%89%8B%E6%9C%BA%E6%8E%A8%E8%8D%90 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
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