string(239) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%92%AA%E5%92%95%E4%BA%92%E5%8A%A8%E5%A8%B1%E4%B9%90%E5%85%AC%E5%8F%B8%E5%AE%98%E7%BD%91 => Received HTTP code 403 from proxy after CONNECT"
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