string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%88%91%E4%BB%AC%E5%85%AC%E5%8F%B8%E8%A2%AB%E9%BB%91%E5%AE%A2%E5%8B%92%E7%B4%A2 => Received HTTP code 403 from proxy after CONNECT"
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