string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%AC%E4%BC%97%E5%8F%B7%E4%BA%A7%E5%93%81%E6%8E%A8%E5%B9%BF%E6%96%B9%E6%A1%88 => Received HTTP code 403 from proxy after CONNECT"
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