string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8B%BC%E5%A4%9A%E5%A4%9A%E5%95%86%E5%AE%B6%E7%B4%A2%E8%A6%81%E5%A5%BD%E8%AF%84 => Received HTTP code 403 from proxy after CONNECT"
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