How to solve the problem of JS resource caching in enterprise WeChat?

Enterprise WeChat JS resource caching problems and response strategies

The JS resource caching problem in the enterprise WeChat environment often causes some users to be unable to experience the latest functions after the project is upgraded. For example, after adding the new buried point tracking function, the same user accesses the same page in the same time period, but may load it into different versions of JS resources (with buried points or without buried points). This is not an isolated case, but is caused by the strong cache strategy of the built-in browser of the enterprise WeChat: once the resource is cached, it will not be requested again unless it is manually refreshed.

Although we set a two-month JS resource expiration time, the old resources may still be loaded because the strong cache mechanism of enterprise WeChat will give priority to reading local caches.

For this problem, the following solutions are available:

1. Directly disable cache (simple and crude method): Set front-end HTTP service Expires to -1. This method is simple and straightforward, but the user may need to clear the local cache to take effect.

2. Ideal solution (content hashing): Set the index.html cache header to Expires -1 and add the content hash value (for example, script.12345.js ) to the static resource name, and then enable cache. This ensures that each resource update will generate a new name, thus avoiding caching problems.

3. Strategies for major changes: For large-scale changes in the project, it is recommended to disable all resource caches first, and then gradually optimize the cache strategy.

To more effectively control the cache of index.html , you can add the following instructions in your server configuration (such as Nginx):

 server {
    listen 80;
    listen 443 ssl;
    ...

    # index.html Cache control location = /index.html {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        add_header Expires -1;
        ...
    }
}

Through the above methods, the enterprise WeChat JS resource caching problem can be effectively solved and ensure that all users can access the latest project resources. Which option to choose depends on the size of the project and maintenance cost considerations.

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