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htaccess file

I have asked this question before but it was for a windows server.  What / how do you write an entry in the .htaccess file to leverage the browser cache?  I want to add images, javascript and css to the browser cache
2 Solutions
What the browser caches is based on how the browser is configured.

If a browser is configured to cache (the default) it should already cache all the files you listed.

For html files, a server can influence if a page is not cached, or how long it is cached for.  It can not force a browser to cache something if the browser is setup to not to cache.

For non-html files (javascript, images, css) you can't control anything dealing with caching on the browser side.  Either the browser is configured to cache or not to cache.
Ray PaseurCommented:
There are some tricks that you can use to prevent  caching on the browser, such as manipulating GET arguments on the CSS and JS links, but not much you can do to cause  it, except produce headers with long-future expiration dates.  Most browsers will cache whatever they can.  I go to lengths to turn the browser cache off, because I'm almost constantly developing and I always want to see the latest version of my CSS and JavaScript files.

You can induce caching on the server (where nearly everything is under your control).  This article shows the design pattern.
Dave BaldwinFixer of ProblemsCommented:
This page https://www.howtoforge.com/make-browsers-cache-static-files-with-mod_expires-on-apache2-debian-squeeze gives examples of how to lengthen the time that is requested for files to expire in the browser cache.  The theory is that keeping files in the browser cache longer speeds up loading the page.

But I'm with Ray on this, I never do it because even the normal browser cache causes problems in development.  If you are still working on the site, I have to recommend that you do not do this.
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