string(294) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%97%A8%E5%BA%97%E5%95%86%E5%AE%B6%E6%9C%80%E6%80%95%E4%BB%80%E4%B9%88%E6%8A%95%E8%AF%89%E6%89%8D%E4%BC%9A%E9%80%80%E6%AC%BE => Failed to connect to 101.89.117.144 port 38208: Connection refused"
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