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### 前言

當存在緩存，可以減少瀏覽器的再次請求，大大提升了網頁的打開速度，一個優秀的緩存策略可以縮短網頁請求資源的距離，減少延遲，并且由于緩存文件可以重復利用，還可以減少帶寬，降低網絡負荷。那么下面我們就來看看服務器端緩存的原理。

### 緩存優化 (max-age)

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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