string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%94%AF%E8%89%BA%E6%91%84%E5%BD%B1%E6%9C%89%E9%99%90%E5%85%AC%E5%8F%B8 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
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