string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%B3%E4%BA%8E%E6%98%9F%E7%A9%BA%E7%9A%84%E7%9F%A5%E8%AF%86%E5%A4%A7%E5%85%A8 => Received HTTP code 403 from proxy after CONNECT"
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