string(257) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B9%B0%E4%B9%A6%E6%9C%80%E5%85%A8%E7%9A%84%E7%BD%91%E4%B8%8A%E4%B9%A6%E5%BA%97%E5%B0%8F%E7%BA%A2%E4%B9%A6 => Received HTTP code 403 from proxy after CONNECT"
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