I have two situations: in one situation my URL is under the 2,048 URL character limit and I can do a normal HTTP GET to retrieve a Google Chart image. In the other situation my URL is greater than 2,048 characters so I have to instead display an HTML form and do an HTTP POST that redirects the resulting Google Chart image to an iframe. All of this works except for one small issue: when I do the HTTP POST method, the chart returned is always the same, so either the same image is being returned or my browser is showing a cached image instead of showing the new image. How do I force both Google Charts AND my browser to not show any cached images and instead show a "fresh" image each time I use the HTTP POST method described above?
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