string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E6%96%87%E7%BB%8F%E5%85%B8%E6%8E%A8%E8%8D%90%E5%B0%8F%E8%AF%B4 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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