string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%95%86%E5%AE%B6%E5%85%A5%E9%A9%BB%E6%98%9F%E5%9B%BE%E5%B9%B3%E5%8F%B0 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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