string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%86%8D%E9%80%A0%E7%B9%81%E8%8D%A3%E7%99%BE%E5%BA%A6%E7%99%BE%E7%A7%91 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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