string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%BD%AC%E7%A7%BB%E5%B0%B1%E4%B8%9A%E7%9B%B8%E5%85%B3%E6%94%BF%E7%AD%96 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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