string(248) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%A3%B8%E8%BD%A66%E4%B8%87%E5%85%83%E5%86%85%E6%9C%80%E5%A5%BD%E7%9A%84%E8%BD%A6 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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