string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%A9%E7%9B%AE%E6%B9%96%E6%97%85%E6%B8%B8%E5%AE%98%E6%96%B9%E7%BD%91%E7%AB%99 => Received HTTP code 403 from proxy after CONNECT"
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