string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%96%B0%E5%8A%A0%E5%9D%A1%E7%95%99%E5%AD%A6%E5%A5%BD%E5%90%97%E7%9F%A5%E4%B9%8E => Received HTTP code 403 from proxy after CONNECT"
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