string(283) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%A6%99%E6%B8%AF%E7%A1%95%E5%A3%AB%E7%95%99%E5%AD%A6%E4%B8%80%E5%B9%B4%E8%8A%B1%E8%B4%B9%E5%A4%9A%E5%B0%91%E9%92%B1 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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