string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BC%9A%E8%AE%A1%E7%A7%91%E7%9B%AE%E8%AF%A6%E8%A7%A3%E6%9C%80%E6%96%B0 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
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