string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E5%AE%89%E6%B3%95%E5%BE%8B%E7%9C%9F%E9%A2%98%E7%AD%94%E6%A1%88 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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