string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B0%8F%E6%8A%95%E8%B5%84%E8%B5%9A%E9%92%B1%E9%A1%B9%E7%9B%AE%E6%8E%A8%E8%8D%90 => Received HTTP code 403 from proxy after CONNECT"
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