string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E4%BC%9A%E8%80%83%E8%AF%95%E7%A7%91%E7%9B%AE%E5%AE%89%E6%8E%92%E8%A1%A8 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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