string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%97%A8%E5%BA%97%E7%AE%A1%E7%90%86%E8%BD%AF%E4%BB%B6%E6%8E%A8%E8%8D%90%E5%85%8D%E8%B4%B9 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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