string(293) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BE%AE%E4%BF%A1%E8%A7%A3%E5%B0%81%E5%A5%BD%E5%8F%8B%E8%BE%85%E5%8A%A9%E9%AA%8C%E8%AF%81%E4%B8%80%E5%AE%9A%E8%A6%81%E5%A5%BD%E5%8F%8B%E5%90%97 => Received HTTP code 403 from proxy after CONNECT"
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