string(212) "get document error:https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%95%86%E5%AE%B6%E6%80%95%E4%BB%80%E4%B9%88%E4%B8%BE%E6%8A%A5 => Received HTTP code 403 from proxy after CONNECT"
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