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string(240) "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%AE%89%E5%85%A8%E6%8A%80%E6%9C%AF%E5%AE%9E%E5%8A%A1+%E4%B8%8B%E8%BD%BD => Received HTTP code 403 from proxy after CONNECT"
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