string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%91%84%E5%BD%B1%E4%BD%9C%E5%93%81%E6%8E%A8%E8%8D%90%E7%BB%99%E4%B8%8A%E7%BA%A7 => Received HTTP code 403 from proxy after CONNECT"
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