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Asked: 2026-05-25T15:08:51+00:00

I have a webapp written in PHP and i generate the headers with header()

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I have a webapp written in PHP and i generate the headers with header() function.

The problem is that when I’m making changes to the javascript code of my app, on clients side, the old javascript will not be executed because is cached to the clients browsers.

How can I automate the process of header expiration? I assume that is has to be a better way than modifying that function each time I modify the javascript code.

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  1. Editorial Team

    The only bullet-proof solution is to change filenames of server-side resources:

    From: Yahoo’s Best Practices for Speeding Up Your Web Site:

    Keep in mind, if you use a far future Expires header you have to change the component’s filename whenever the component changes. At Yahoo! we often make this step part of the build process: a version number is embedded in the component’s filename[…]

    Of course this process must be automated. We are appending JavaScript file contents hash into file name.

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