string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%99%90%E5%8F%B7%E7%BD%9A%E6%AC%BE%E6%97%B6%E9%97%B4%E9%99%90%E5%88%B6 => Failed to connect to 101.89.159.206 port 38187: Connection refused"
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