string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%88%9B%E4%B8%9A%E5%A4%B4%E5%83%8F%E5%9B%BE%E7%89%87%E5%A4%A7%E5%85%A8%E7%94%B7 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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