string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E7%BB%9C%E5%85%BC%E8%81%8C%E7%9A%84%E6%AD%A3%E8%A7%84%E7%BD%91%E7%AB%99 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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