string(212) "get document error:https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%9B%B6%E5%9F%BA%E7%A1%80%E5%89%AF%E4%B8%9A%E6%8E%A8%E8%8D%90 => Received HTTP code 403 from proxy after CONNECT"
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