[COCOON-1619] Internal pipelines eat HTTP headers without warning

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.1.7
• Component/s: * Cocoon Core
• Environment: Operating System: other; Platform: Other
• Bugzilla Id: 36872
• Assignee: Unassigned
• Reporter: Bertrand Delacretaz
• Created: 30/Sep/05 14:27
• Updated: 16/Feb/11 13:55

Description

See http://marc.theaimsgroup.com/?t=112617026700001&r=1&w=2

And
http://marc.theaimsgroup.com/?t=111746450000002&r=1&w=2
http://marc.theaimsgroup.com/?l=xml-cocoon-dev&m=109785174903101&w=2

When there are good reasons to block response headers set in internal pipelines,
we should at least output a warning to make it visible.

Also, it seems like 2.1.7 eats headers set by *mounted* sitemaps, which is not
correct, headers are needed for example to control front-end caches.

Need some test cases to verify this with mounted, internal and top-level
pipelines, and probably a fix for the "mounted" case.