This C-T: limitation was removed in 2.2.12 and retconned into CHANGES much later.
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@
1586441 13f79535-47bb-0310-9956-
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<p>Except in <a href="#early">early</a> mode, the
<directive>Header</directive> directives are processed just
before the response is sent to the network. These means that it is
- possible to set and/or override most headers, except for those headers
- added by the header filter.</p>
+ possible to set and/or override most headers, except for some headers
+ added by the HTTP header filter. Prior to 2.2.12, it was not possible
+ to change the Content-Type header with this directive.</p>
</usage>
</directivesynopsis>