string(292) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%96%E7%95%8C%E4%B8%8A%E5%8D%81%E5%A4%A7%E5%9C%B0%E9%9C%87%E6%8E%92%E5%90%8D%E8%A1%A8%E5%9B%BE%E7%89%87%E5%A4%A7%E5%85%A8 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
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