string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E6%96%87%E4%BA%BA%E6%B0%94%E6%8E%92%E8%A1%8C%E6%A6%9C%E6%9C%80%E6%96%B0 => Received HTTP code 403 from proxy after CONNECT"
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