string(274) "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%96%B0%E5%BA%97%E5%BC%80%E4%B8%9A%E9%82%80%E8%AF%B7%E5%87%BD%E6%80%8E%E4%B9%88%E5%8F%91 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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