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Reply to topic   Topic: FilesMatch
Author
MysteryFalcon



Joined: 01 Dec 2021
Posts: 3
Location: Stockholm

PostPosted: Wed 01 Dec '21 13:00    Post subject: FilesMatch Reply with quote

I would like to turn on cache for specific .jpgs on a website, located in specific directories but I'm a bit uncertain how this would be done.
This is the structure I would like caching to apply to:

<FilesMatch "usr/*/[ALPHANUMERIC].jpg">

Does anyone know how to solve this? Help is much appreciated.
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James Blond
Moderator


Joined: 19 Jan 2006
Posts: 7115
Location: Germany, Next to Hamburg

PostPosted: Wed 01 Dec '21 17:13    Post subject: Reply with quote

That is a regex

Code:
usr\/(.*)\/\w+\.(jpe?g)$


See https://regexper.com/#usr%5C%2F%28.*%29%5C%2F%5Cw%2B%5C.%28jpe%3Fg%29%24
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tangent



Joined: 16 Aug 2020
Posts: 213
Location: UK

PostPosted: Wed 01 Dec '21 17:34    Post subject: Reply with quote

Rather than get into the complexity of setting up and managing server side cache resources (memory or disk), I've previously passed this requirement over to the client browser, to prevent repeat requests for the same static files.

In the global section of your configuration file put something like:
Code:
# Set cache control environment variables for selected file request types.
# These variables are used to conditionally set cache-control headers.
#
RewriteCond %{REQUEST_URI} (?i)\.(css|js)$
RewriteRule .* - [E=ShortCache:true,NE]

RewriteCond %{REQUEST_URI} (?i)\.(gif|jpg|jpeg|png)$
RewriteRule .* - [E=LongCache:true,NE]

RewriteCond %{REQUEST_URI} (?i)\.app$
RewriteRule .* - [E=NoCache:true,NE]

and then further down (global or vhosts) add the following (adjusting max-age to suit):
Code:
# Set cache control header for selected file types, with an expiry time of 2 hours
# for script files, 24 hours for image files, and no cache for application files.
#
Header set Cache-Control "max-age=7200" env=ShortCache
Header set Cache-Control "max-age=86400" env=LongCache
Header set Cache-Control "no-cache, no-store, must-revalidate" env=NoCache
Header set Pragma "no-cache" env=NoCache

Accepting this strategy does rather depend on your site content and function, but in the past I've found this approach make a signficant difference to server throughput.
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MysteryFalcon



Joined: 01 Dec 2021
Posts: 3
Location: Stockholm

PostPosted: Thu 02 Dec '21 16:36    Post subject: Reply with quote

Many thanks for the help!!
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