string(233) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B9%BF%E5%91%8A%E8%81%94%E7%9B%9F%E4%B8%80%E5%A4%A9%E8%83%BD%E8%B5%9A500%E5%90%97 => Received HTTP code 403 from proxy after CONNECT"
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