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string(221) "get document error:https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%A9%E7%8C%AB%E7%B2%BE%E7%81%B5%E8%83%BD%E5%B9%B2%E5%95%A5%E5%91%80 => Received HTTP code 403 from proxy after CONNECT"
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