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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=%E6%95%B4%E5%9C%BA%E7%9B%B4%E6%92%AD%E6%B4%BB%E5%8A%A8%E7%AD%96%E5%88%92 => Received HTTP code 403 from proxy after CONNECT"
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