On the project I’m working on, we’re desperately trying to improve performance. One of the approaches taken by my coworkers was to add the SimplePageCachingFilter from Ehcache, so that Ehcache can serve frequently hit pages that aren’t completely dynamic. However, it occurred to me that the SimplePageCachingFilter can be improved by adding support for the HTTP caching headers (namely, ETags, Expires, Last-Modified, and If-Modified-Since). Adding these headers will do two important things:
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