string(266) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%8E%AB%E8%A8%80%E8%8E%B7%E8%AF%BA%E5%A5%96%E6%84%9F%E8%A8%80%E5%85%A8%E6%96%87%E5%9C%A8%E7%BA%BF%E9%98%85%E8%AF%BB => Received HTTP code 403 from proxy after CONNECT"
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