string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%96%B0%E6%89%8B%E4%B8%BB%E6%92%AD%E7%9B%B4%E6%92%AD%E8%81%8A%E4%BB%80%E4%B9%88 => Received HTTP code 403 from proxy after CONNECT"
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