string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%A9%E7%8C%AB%E5%B0%8F%E5%BA%97%E5%AE%98%E6%96%B9%E7%BD%91%E7%AB%99 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
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