What are the front-end cache processing mechanisms?

Front-end cache processing mechanisms include browser cache, reverse proxy cache, CDN cache, page lazy loading, preloading, Service Workers, caching strategy, compression and optimization, etc. Detailed introduction: 1. Browser cache refers to saving the data of visited web pages in the browser so that the data can be obtained from the cache when the user visits again without having to download it from the server again; 2. Reverse proxy cache, It is a caching mechanism that forwards requests to the back-end server and saves the response results of the back-end server on the proxy server, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

The front-end cache processing mechanism refers to the use of caching technology on the browser side to improve the performance and response speed of the website. The following are common front-end cache processing mechanisms:

1. Browser cache:

Browser cache refers to saving the data of visited web pages in the browser so that it can be used when the user visits again Get the data from the cache without re-downloading it from the server. Browser caching can reduce network latency and server load, improving website performance and response speed. Common browser caching technologies include HTTP caching, cookies, LocalStorage, etc.

2. Reverse proxy cache:

Reverse proxy cache is a caching mechanism that forwards requests to the back-end server and saves the response results of the back-end server on the proxy server. . When the user accesses the same content again, the proxy server can directly return the cached results without sending another request to the backend server. Common reverse proxy caching technologies include Nginx, Varnish, etc.

3. CDN caching:

CDN (Content Delivery Network) caching is a caching mechanism that distributes web content to servers in multiple geographical locations so that users can obtain content nearby. By using CDN technology, web content can be distributed on servers in multiple geographical locations, thereby reducing network latency and load and improving website response speed. Common CDN caching technologies include Cloudflare, Akamai, etc.

4. Page lazy loading:

Page lazy loading is a caching mechanism that loads web content on demand. By using page lazy loading technology, web content can be loaded gradually as needed, thereby improving the response speed and performance of the website. Common page lazy loading technologies include Intersection Observer API, dynamic import, etc.

5. Preloading:

Preloading is a caching mechanism that loads web page content into the browser in advance. By using preloading technology, web page content can be loaded into the browser in advance before users access the web page, thereby reducing the loading time when users access the web page. Common preloading technologies include link rel="preload", prerendering, etc.

6. Service Workers:

Service Workers are a kind of worker thread running in the browser, which can intercept and process network requests, and provide caching and offline functions. By using Service Workers technology, website resources can be cached in the browser, thereby providing website content offline and improving website availability and response speed. Common Service Workers technologies include sw-precache, sw-toolbox, etc.

7. Caching strategy:

Cache strategy refers to the methods and strategies adopted when using cache. Common caching strategies include LRU (Least Recently Used), LFU (Least Frequently Used), etc. By formulating appropriate caching strategies, cached data can be effectively managed and maintained, and the cache hit rate and response speed can be improved.

8. Compression and optimization:

Compression and optimization refers to compressing and optimizing code and resources during the front-end development process to reduce file size and network transmission volume and improve website response. Speed ​​and performance. Common compression and optimization technologies include code compression, image optimization, font optimization, etc.

In short, the front-end cache processing mechanism is one of the important means to improve website performance and response speed. By choosing appropriate caching mechanisms and technologies, network latency and server load can be effectively reduced, and application performance and response speed can be improved. However, you need to pay attention to issues such as cache consistency, data update and maintenance, to ensure data accuracy and reliability.

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