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                            ![](https://img.kancloud.cn/10/57/1057201d74940b54999d02eceed92a11_1010x509.png)

1. 如圖，核心對象app和請求對象Request都有上下文對象，他們是兩個棧。
2. 當一個請求進來，Request對象入棧，同時會自動讓app對象進入appContext棧中。
3. 所以，沒有請求進來時，使用appContext中不會入棧app。所以可以主動使其入棧，或者使用with。
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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