string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E5%AE%89%E5%BB%BA%E7%AD%91%E5%AE%9E%E5%8A%A1%E8%80%81%E5%B8%88%E6%8E%A8%E8%8D%90%E7%9F%A5%E4%B9%8E => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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