string(239) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%BA%AB%E4%BB%BD%E8%AF%81%E5%8F%B7%E5%92%8C%E6%89%8B%E6%9C%BA%E5%8F%B7%E5%85%8D%E8%B4%B9 => Received HTTP code 403 from proxy after CONNECT"
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