Thanks for the consideration but the problem in this case is that the render size of the output depends on the window size of the users browser which varies from user to user. Calls requesting the same geometry from the same user are taken care of by client-side caching and Servlet.getLastModified().
Imagine 10000 different clients requesting the same rendering.
Well, yes, but as I said the normal situation are 10000 different clients requesting different renderings. If I were to cache the rendering I would end up with 10000 cached but unused renderings.
Regards Robert
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