string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%8B%B9%E6%9E%9Cid%E7%BE%8E%E5%9B%BD%E6%B3%A8%E5%86%8C%E6%95%99%E7%A8%8B => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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