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https://issues.apache.org/jira/browse/CXF-4927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15406024#comment-15406024
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Sergey Beryozkin commented on CXF-4927:
---------------------------------------

You should be able to find a confirmation from one of the spec leads in the 
JAX-RS 1.1 or 2.0 archives

> HttpHeaders.getRequestHeader has to return null if no header is available
> -------------------------------------------------------------------------
>
>                 Key: CXF-4927
>                 URL: https://issues.apache.org/jira/browse/CXF-4927
>             Project: CXF
>          Issue Type: Bug
>          Components: JAX-RS
>            Reporter: Sergey Beryozkin
>            Assignee: Sergey Beryozkin
>            Priority: Minor
>             Fix For: 3.0.0-milestone1
>
>
> At the moment an empty list is returned if no header is available but this 
> conflicts with the case when an empty header is provided. Lets limit the 
> update to 2.8.0 as it may break some of the older code



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