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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%B9%BF%E5%91%8A%E5%90%88%E5%90%8C%E8%8C%83%E6%9C%AC%E5%A4%A7%E5%85%A8 => Received HTTP code 403 from proxy after CONNECT"
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