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https://issues.apache.org/jira/browse/WICKET-4083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13114084#comment-13114084
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Peter Ertl commented on WICKET-4083:
------------------------------------

It seems there is no corresponding counterpart for header value "no-cache". I 
don't like to elimimate an eventual "no-cache" value with an empty header like 
this:

  Pragma: 

Some (broken) servers could have a problem with that...

Also 

  setHeader("Pragma", null) 

works on jetty but could be fragile on some others servlet containers.

Also there's no way in the servlet api to remove an header completely. So I 
will add 

  Pragma: cache

which clearly signal our intention. Even in the case of an unknown value it 
will not hurt.

@Rodolfo: Thanks for reporting!

> WebResponse#enableCaching does not take care of a possible "Pragma: no-cache" 
> header
> ------------------------------------------------------------------------------------
>
>                 Key: WICKET-4083
>                 URL: https://issues.apache.org/jira/browse/WICKET-4083
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>            Reporter: Rodolfo Hansen
>            Assignee: Peter Ertl
>            Priority: Minor
>
> in WebResponse#enableCaching 
> a call to setHeader("Pragma", "") might be a good idea to assure that no 
> conflicting http header information is being sent out.

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