string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B7%98%E5%AE%9D%E5%BF%AB%E6%B6%88%E5%93%81%E6%B7%98%E7%A4%BC%E9%87%91 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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