string(284) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%96%E7%95%8C%E6%9D%AF%E8%B6%B3%E7%90%83%E8%B5%9B%E8%A7%82%E5%90%8E%E6%84%9F%E8%A5%BF%E7%8F%AD%E7%89%99%E8%91%A1%E8%90%84%E7%89%99 => Received HTTP code 403 from proxy after CONNECT"
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