string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%9B%91%E7%90%86%E8%B5%84%E6%96%99%E5%A4%A7%E5%85%A8%E6%9F%A5%E8%AF%A2 => Failed to connect to 101.89.143.195 port 38109: Connection refused"
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