I always get confused about which HTTP caching header does what, and what the expected effect of each one is. So, I'm glad I found this caching tutorial which it explains it all remarkably clearly. If you're looking for a way to speed up your site, HTTP caching is big win - so check out the above tutorial.
I also found these articles valuable:
- HTTP Caching - Apache Configuration
- Improve Performance with Cache-Control Headers
- .htaccess Caching
The last article is especially handy because it suggests changes that you can make in a .htaccess file, which is available to you even if you can't change the Apache global configuration.
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