string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%9D%AD%E5%B7%9E%E5%85%AC%E4%BA%A4%E8%B7%AF%E7%BA%BF%E6%8E%A8%E8%8D%90 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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