How to add response headers based on Content-type; getting Content-type before the response is commi

Posted by Bozho on Stack Overflow See other posts from Stack Overflow or by Bozho
Published on 2010-04-01T20:10:48Z Indexed on 2010/04/01 20:53 UTC
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java

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servlets

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tomcat

I want to set the Expires header for all image/* and text/css. I'm doing this in a Filter. However:

before calling chain.doFilter(..) the Content-type is not yet "realized"
after calling chain.doFilter(..) the Content-type is set, but so is content-length, which forbids adding new headers (at least in Tomcat implementation)

I can use the extensions of the requested resource, but since some of the css files are generated by richfaces by taking them from inside jar-files, the name of the file isn't x.css, but is /xx/yy/zz.xcss/DATB/....

So, is there a way to get the Content-type before the response is committed.

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