Jens Vagelpohl wrote:
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On 17 Dec 2006, at 18:52, Dieter Maurer wrote:
The description indicates in what direction the CPM should get fixed:
* If the response already provides cache control, the CPM should
not override it, as it is likely that the specific information
available to the response generating process is more trustworthy
then the general CPM policies.
This is arguable, especially as it changes the current behaviour.
Maybe, it should be controlled by an additional configuration
option.
I don't know if it is possible to have any sane policy about "what to
do if the response already has caching headers". First of all, when
should this exception policy trigger? Which headers should tell the CPM
that someone else already decided on caching? Secondly, what is the
behavior supposed to be? "Do nothing"? "DWIM"? This obviously needs
exact specifications and use cases.
At the moment, the CPM fires after rendering, so setting it's own
headers and overwriting any headers set in the template. If it fired
before rendering, then a template would be free to set whatever policy
it wanted.
Is there a special reason why it needs to set the headers after
rendering, rather than before? I can't think of a reason, but then our
policies are about as simple as can be.
Miles
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