string(252) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BA%A2%E5%AE%9D%E4%B9%A6%E8%AF%8D%E6%B1%87pdf%E4%B8%8B%E8%BD%BD%E5%85%8D%E8%B4%B9 => Failed to connect to 101.89.159.206 port 38075: Connection refused"
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