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In GWT, JavaScript resources are somehow wrapped in HTML files to work around browser issues with gzip compressed JavaScript: http://code.google.com/webtoolkit/doc/1.6/FAQ_DebuggingAndCompiling.html#What's_with_all_the_cache/nocache_stuff_and_weird_filenames We should check if this would also work and help for RAP.
We didn't run into any problems in this regard. Moreover, we're planning to discontinue support for very old browser versions.