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https://issues.apache.org/jira/browse/OFBIZ-6664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14948750#comment-14948750
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Jacques Le Roux commented on OFBIZ-6664:
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OK I read the document, I remember that
* Contents (images, js, css, etc.) in HTTPS are not cached
* Most of the time POST requests results are not cached
* Most modern Web servers automatically generate both ETag and Last-Modified 
validator for static content (ie, files); you will have nothing to do

Also I believe we don't care to OOTB cache things in the backend side. The 
backend should be mostly used locally. We use HTTPS and mostly POST in the 
backend. So I would let that for users to configure in function of their needs, 
one worry less. 

Now if we want to introduce some caching OOTB it should be in the ecommerce 
component, rather as an example to be adapted. Then expires and Cache-Control 
HTTP directives should be wisely used in conjuction with ETag and Last-Modified 
validators. This could be useful 
https://redbot.org/?uri=http%3A%2F%2Fdemo-trunk-ofbiz.apache.org%2Fecommerce%2Fcontrol%2Fmain
 to begin



> Enhance theme js and css settings with caching and other parameters.
> --------------------------------------------------------------------
>
>                 Key: OFBIZ-6664
>                 URL: https://issues.apache.org/jira/browse/OFBIZ-6664
>             Project: OFBiz
>          Issue Type: Improvement
>          Components: themes
>    Affects Versions: Trunk, Bootstrap theme
>            Reporter: Pierre Smits
>
> In order to have fast rendering of pages multiple options are available. 
> These include cache-control and async for css and js files.
> Currently those settings can't be set when using visual theme resources. In 
> order to enhance the user experience and aiding developers we should figure 
> out a way to set those variables in the dataset(s) of themes.



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