string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BC%9A%E8%AE%A1%E6%9C%8D%E5%8A%A1%E8%80%83%E8%AF%95%E5%85%AC%E4%BC%97%E5%8F%B7 => Received HTTP code 403 from proxy after CONNECT"
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