string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AD%E5%9B%BD%E6%9C%80%E5%A4%A7%E7%9A%84%E9%94%80%E5%94%AE%E7%BD%91%E7%AB%99 => Received HTTP code 403 from proxy after CONNECT"
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