string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BB%8F%E6%B5%8E%E7%B1%BB%E8%80%83%E7%A0%94%E4%B8%93%E4%B8%9A%E6%8E%A8%E8%8D%90 => Received HTTP code 403 from proxy after CONNECT"
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