string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B7%B1%E5%9C%B3%E6%AC%A2%E4%B9%90%E8%B0%B7%E5%9B%A2%E8%B4%AD%E7%BD%91%E7%AB%99%E5%AE%98%E7%BD%91 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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