string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%9B%B4%E6%92%AD%E5%8D%96%E8%B4%A7%E9%94%80%E5%94%AE%E6%8A%80%E5%B7%A7 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
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