string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BC%98%E7%A7%80%E7%9F%AD%E8%A7%86%E9%A2%91%E7%BD%91%E7%AB%99%E6%8E%A8%E8%8D%90 => Received HTTP code 403 from proxy after CONNECT"
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