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 dynam…

That should get you started – http://intertwingly.net/blog/2007/09/30/Etag-vs-Encoding ]]> http://candrews.integralblue.com/2009/02/http-caching-header-aware-servlet-filter/comment-page-1/#comment-57 Alexandre Victoor Fri, 09 Oct 2009 22:22:32 +0000 http://candrews.integralblue.com/?p=32#comment-57 Thanks for this filter. I think there might be a concurrency bug : SimpleDateFormat is not a thread safe class, getHttpDate() and getDateFromHttpDate() are synchronized but could be called by two different threads at the same time... Thanks for this filter.
I think there might be a concurrency bug : SimpleDateFormat is not a thread safe class, getHttpDate() and getDateFromHttpDate() are synchronized but could be called by two different threads at the same time… ]]> http://candrews.integralblue.com/2009/02/http-caching-header-aware-servlet-filter/comment-page-1/#comment-56 Craig Andrews Mon, 10 Aug 2009 15:45:27 +0000 http://candrews.integralblue.com/?p=32#comment-56 Assuming you've stuck to good HTTP design (ex GETs don't modify data), you can use this filter for all pages, so everything will benefit from the additional headers and caching. Assuming you’ve stuck to good HTTP design (ex GETs don’t modify data), you can use this filter for all pages, so everything will benefit from the additional headers and caching. ]]> http://candrews.integralblue.com/2009/02/http-caching-header-aware-servlet-filter/comment-page-1/#comment-55 Alberto Mon, 10 Aug 2009 02:34:01 +0000 http://candrews.integralblue.com/?p=32#comment-55 Hi Craig, how do you suggest map this filter in web.xml? just for pages that i want or leave for all pages in my web application? Hi Craig, how do you suggest map this filter in web.xml? just for pages that i want or leave for all pages in my web application? ]]> http://candrews.integralblue.com/2009/02/http-caching-header-aware-servlet-filter/comment-page-1/#comment-45 Craig Andrews Mon, 23 Mar 2009 15:46:14 +0000 http://candrews.integralblue.com/?p=32#comment-45 The filter is included in EhCache 1.6 beta 1. It is named SimpleCachingHeadersPageCachingFilter and the source is at http://ehcache.svn.sourceforge.net/viewvc/ehcache/trunk/web/src/main/java/net/sf/ehcache/constructs/web/filter/SimpleCachingHeadersPageCachingFilter.java?view=markup The filter is included in EhCache 1.6 beta 1. It is named SimpleCachingHeadersPageCachingFilter and the source is at http://ehcache.svn.sourceforge.net/viewvc/ehcache/trunk/web/src/main/java/net/sf/ehcache/constructs/web/filter/SimpleCachingHeadersPageCachingFilter.java?view=markup ]]> http://candrews.integralblue.com/2009/02/http-caching-header-aware-servlet-filter/comment-page-1/#comment-44 Craig Andrews Mon, 23 Mar 2009 15:20:30 +0000 http://candrews.integralblue.com/?p=32#comment-44 I don't see where it says that the etag should vary by content-encoding. Could you point that part out to me? I'll make the quoting change - thanks! I don’t see where it says that the etag should vary by content-encoding. Could you point that part out to me?
I’ll make the quoting change – thanks! ]]> http://candrews.integralblue.com/2009/02/http-caching-header-aware-servlet-filter/comment-page-1/#comment-43 James Abley Wed, 18 Mar 2009 20:52:41 +0000 http://candrews.integralblue.com/?p=32#comment-43 Nice. Minor comment. ETag should be a quoted string [1]. It should also vary depending on the Content-Encoding used. [1] http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.11 Nice. Minor comment. ETag should be a quoted string [1]. It should also vary depending on the Content-Encoding used.

[1] http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.11 ]]>