string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BE%AE%E4%BF%A1%E6%96%B0%E5%8A%9F%E8%83%BD%E7%BE%A4%E8%81%8A%E6%8A%98%E5%8F%A0 => Received HTTP code 403 from proxy after CONNECT"
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