string(212) "get document error:https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%80%8E%E4%B9%88%E8%B4%AD%E4%B9%B0%E8%80%81%E8%99%8E%E6%9C%BA => Received HTTP code 403 from proxy after CONNECT"
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