string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%80%8E%E4%B9%88%E7%BB%99%E8%80%81%E4%BA%BA%E7%94%B3%E8%AF%B7%E5%81%A5%E5%BA%B7%E7%A0%81%E5%BE%AE%E4%BF%A1 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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