string(212) "get document error:https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%AB%A5%E8%A3%85%E5%8A%A0%E7%9B%9F%E5%BC%80%E7%BD%91%E5%BA%97 => Received HTTP code 403 from proxy after CONNECT"
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