string(230) "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%E6%89%B9%E9%87%8F%E5%88%A0%E9%99%A4%E8%AF%A5%E8%81%8A%E5%A4%A9 => Received HTTP code 403 from proxy after CONNECT"
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