string(251) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B6%88%E9%98%B2%E5%B7%A5%E7%A8%8B%E5%B8%88%E6%95%99%E6%9D%90pdf%E5%85%8D%E8%B4%B9%E4%B8%8B%E8%BD%BD => Received HTTP code 403 from proxy after CONNECT"
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