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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=%E7%94%B5%E8%AF%9D%E8%90%A5%E9%94%80%E6%8E%A8%E5%B9%BF%E5%85%AC%E5%8F%B8 => Received HTTP code 403 from proxy after CONNECT"
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