string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BE%AE%E4%BF%A1%E6%9C%8B%E5%8F%8B%E5%9C%88%E8%A6%81%E5%B8%90%E7%9A%84%E5%8F%A5%E5%AD%90 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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