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https://issues.apache.org/jira/browse/SLING-11514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17576247#comment-17576247
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Carsten Ziegeler commented on SLING-11514:
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Add new option to RequestDispatcherOptions in
https://github.com/apache/sling-org-apache-sling-api/commit/1e99ec1c5e6f3d3aabd40126a4f374f62d26bbc2
> Provide dispatcher option to ignore header changes on include
> -------------------------------------------------------------
>
> Key: SLING-11514
> URL: https://issues.apache.org/jira/browse/SLING-11514
> Project: Sling
> Issue Type: New Feature
> Components: API, Engine
> Reporter: Carsten Ziegeler
> Assignee: Carsten Ziegeler
> Priority: Major
> Fix For: API 2.26.0, Engine 2.9.4
>
>
> The servlet specification states in section 9.3 that on dispatcher include
> (not forward), all changes to headers from the include must be ignored.
> As Sling is following the servlet spec for includes and forwards, Sling
> should do the same. However, after 15 years of allowing an include to change
> headers, this has a large potential to break existing applications.
> Therefore we should rather provide a dispatcher option, that can be set to
> force this new behaviour.
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