string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%89%8B%E6%9C%BAip%E5%9C%B0%E5%9D%80%E6%9F%A5%E7%9C%8B%E8%BD%AF%E4%BB%B6 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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