string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A5%BD%E5%90%AC%E7%9A%84%E7%8E%AF%E4%BF%9D%E6%AD%8C%E6%9B%B2%E6%8E%A8%E8%8D%90 => Received HTTP code 403 from proxy after CONNECT"
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