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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%BE%AE%E4%BF%A1%E6%90%9C%E7%8B%97%E6%96%87%E7%AB%A0%E6%90%9C%E7%B4%A2 => Received HTTP code 403 from proxy after CONNECT"
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