Chris Lott wrote:
Hi,
Summary: Please tell me what headers Tomcat 5.0.28 sets when it serves out a
plain file, and how I can control those headers.
..
I found more detail and found a possible solution. I still welcome your
comments.
To figure out what headers Tomcat sets in responses, I turned on the
RequestDumperValve in the server.xml file. There I saw that every
single request -- whether .gif, .html, .css, .ppt, or .jsp -- gets
"Cache-Control: no-cache" and "Pragma: no cache" in the response
headers. So that answers my first question. (And the Apache sitting in
front of Tomcat seems to have no influence here whatsoever.)
A possible solution came from here:
http://www.jspinsider.com/content/dev/afessh/another-filter-every-site-should-have.html
where Jayson Falkner discusses using servlet filters to set response
headers so web browsers will cache items like pictures and other static
content. I used this approach with some success.
I still have one question and/or a suggestion: it seems that Tomcat
needs some configuration setting so users like me can tell the container
what caching policy to apply by default. Maybe it exists, but I have
not found it. Possibly an enhancement, sort of like a mime-types file,
would allow the caching policy to be set based on file suffixes or
file-name patterns.
Thanks for listening, and I would sure appreciate guidance if I'm all
wet here, or confirmation that I'm on the right path.
chris...
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