string(248) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%8D%E8%B4%B9%E6%89%AB%E4%B8%80%E6%89%AB%E8%AF%86%E5%88%AB%E5%AD%97%E4%BD%93%E8%BD%AF%E4%BB%B6 => Received HTTP code 403 from proxy after CONNECT"
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