string(292) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%94%AF%E4%BB%98%E5%AE%9D%E4%B8%AA%E4%BA%BA%E8%B4%A6%E6%88%B7%E5%8F%AF%E4%BB%A5%E5%AF%B9%E5%85%AC%E8%BD%AC%E8%B4%A6%E5%90%97 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
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