string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%89%80%E6%9C%89%E5%93%81%E7%89%8C%E6%89%8B%E6%9C%BA%E5%A4%A7%E5%85%A8 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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