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https://issues.apache.org/jira/browse/WICKET-3021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903853#action_12903853
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Peter Ertl commented on WICKET-3021:
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@igor: yes, and we should mention that in the migration notes (whoever
maintains them).
> Add timestamp part to resource filenames for better caching
> -----------------------------------------------------------
>
> Key: WICKET-3021
> URL: https://issues.apache.org/jira/browse/WICKET-3021
> Project: Wicket
> Issue Type: Improvement
> Components: wicket
> Affects Versions: 1.5-M1
> Reporter: Peter Ertl
> Attachments: timestamp-for-resources.patch
>
>
> Even though we have
> getResourceSettings().setAddLastModifiedTimeToResourceReferenceUrl() this
> still is far from perfect. It will add a query parameter to resource
> filenames so caches should invalidate when the parameter changes. However if
> caching is very aggressive altering the query param might not be enough. Then
> there will be stale resources left in the cache of the browser or some
> intermediate proxy. Users will complain and you have to tell them to press
> F5, clear the cache, or whatever :-(
> So I decided to implement support for adding the timestamp of the resource as
> part of the filename.
> When you have a resource link like
> <link rel="stylesheet" type="text/css"
> href="wicket/resource/my.great.app.HomePage/css/style.css"/>
> a timestamp (the last modified timestamp of the file) will be injected into
> the base name of the file
> <link rel="stylesheet" type="text/css"
> href="wicket/resource/my.great.app.HomePage/css/style-ts1282376261000.css"/>
> the format is
> [path-component]* / [base-filename] "-ts" [timestamp-in-milliseconds]
> (.extension)
> The prefix "-ts" (TS = timestamp) is to avoid naming conflicts with filenames
> that already got with a numeric part before the extension.
> Locales, style and variations are taken into consideration (e.g. style.css,
> style_de.css, style_en.css)
> When running your test cases the MockApplication which WicketTester provides
> in the default case has timestamps disabled so you can check you rendered
> markup against some predictable url.
> You can control and check timestamp behavior with
> getResourceSettings().setUseTimestampOnResources()
> and
> getResourceSettings().getUseTimestampOnResources()
> Default behavior is 'enabled'
> You are now able to configure your resource caching for a very large lifetime
> (say 'infinite' :-) and get the best possible network performance and
> utilization of proxies.
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