I'm curious to know if browser caching of CSS and JavaScript is done automatically with PHP or if we need to manually implement it through code.
What are the benefits of manually caching CSS and JS files to the client's browser using code?
Any thoughts?
If not cached, what will happen?
Typically, web browsers do not cache CSS or JS files that are served via PHP or any other dynamic server-side language. The HTTP response headers generated by PHP will indicate that the file was last updated on the current date. To ensure that clients can cache the response, it is necessary to manually implement a conditional GET.
If you need guidance on how to do this, take a look at this resource. While it focuses on RSS, the principles apply to any type of HTTP request.
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