string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8A%96%E9%9F%B3%E8%A7%86%E9%A2%91%E5%88%9B%E4%BD%9C%E6%96%87%E6%A1%88 => Failed to connect to 101.89.117.144 port 38056: Connection refused"
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