string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BE%AE%E4%BF%A1%E5%BC%95%E6%B5%81%E8%AF%9D%E6%9C%AF%E5%A4%A7%E5%85%A8%E6%90%9E%E7%AC%91%E8%A7%86%E9%A2%91 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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