string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BC%81%E4%B8%9A%E5%AE%98%E7%BD%91%E8%90%A5%E9%94%80%E6%8E%A8%E5%B9%BF => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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