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HomeHomeUsing DNN Platf...Using DNN Platf...Performance and...Performance and...Exploiting the Browser CachingExploiting the Browser Caching
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8/29/2011 8:18 AM
 
Richard Howells


Richard Howells's Avatar

www.dynamisys.co.uk
Joined: 3/26/2006
Posts: 2001
I've been heavily influenced by this article - http://blog.httpwatch.com/2007/12/10/... 

The author suggests that when html pages call for images, css, and scripts, they should do so with a version number.  When I looked at the home page of www.DotNetNuke.com this morning, I noticed that the CSS files are linked using url's like...

href="/DesktopModules/CommunityDirectory/module.css?4537502"

Watching the http traffic with fiddler makes it clear that the files have long expiry dates and the browser avoids any kind of download cost for these files.

So now I am curious - this is not 'standard' default DNN behaviour.

Where do those numbers (4537502 and friends) come from? 

Is this behaviour configurable in late versions of DNN? 

Does it require an add on? 

I had been thinking of making (and contributing) a custom modification to the DNN source code, but it looks like it's been done already.

Best wishes,
- Richard
Agile Development Consultant, Practitioner, and Trainer
www.dynamisys.co.uk
 
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8/31/2011 1:04 PM
 
cathal connolly


cathal connolly's Avatar

www.cathal.co.uk
Joined: 4/9/2003
Posts: 9676
They are cache keys for the files and were added in 6.0. When a new release comes along if the file has changed the key will be different forcing the browser to accept the new files, if the files stay the same you retain the caching. Please note, we're doing some other performance related work in this area for 6.1.0 (I expect someone will blog about it soon) and hope to further boost performance.
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8/31/2011 3:31 PM
 
Richard Howells


Richard Howells's Avatar

www.dynamisys.co.uk
Joined: 3/26/2006
Posts: 2001
That sounds brilliant.  I love it already because it sounds completely automatic and I *LOVE* a free lunch.  Where do the numbers come from?  Are they some kind of hash of the file?
Best wishes,
- Richard
Agile Development Consultant, Practitioner, and Trainer
www.dynamisys.co.uk
 
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8/31/2011 7:35 PM
 
cathal connolly


cathal connolly's Avatar

www.cathal.co.uk
Joined: 4/9/2003
Posts: 9676
it's time based (ticks from a fixed date to the last write time)-take a look at RegisterStyleSheet in PageBase (note: you can force a refresh by adding using "refresh" in the path e.g install.css?refresh forces every install to use the new install.css file. Note: there may be changes to this model as we're doing some other work in this area currently.
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