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string(239) "get document error:https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%AD%A3%E7%89%88%E4%B9%A6%E7%B1%8D%E8%B4%AD%E4%B9%B0%E7%BD%91%E7%AB%99%E6%8E%A8%E8%8D%90 => Received HTTP code 403 from proxy after CONNECT"
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