string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%87%91%E7%89%8C%E4%BA%92%E5%A8%B1%E6%9C%89%E9%99%90%E5%85%AC%E5%8F%B8%E6%8B%9B%E8%81%98 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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