string(266) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%B0%81%E8%8E%B7%E5%BE%97%E8%AF%BA%E8%B4%9D%E5%B0%94%E5%92%8C%E5%B9%B3%E5%A5%96%E4%BA%89%E8%AE%AE%E6%9C%80%E5%A4%A7 => Received HTTP code 403 from proxy after CONNECT"
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