Github user klopfdreh commented on the issue:
https://github.com/apache/wicket/pull/225
All in all there are currently some errors regarding the caching of the
resources which are pushed. It currently behaves like this:
Resource pushed (no status code) > 200 OK (served via link tag) > 304 NOT
MODIFIED (received from cache)
It should be:
Resource pushed (no status code) > 304 NOT MODIFIED (received from cache)
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