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The common/wrapper/drawmap.php script doesn't return any "Content-type" header for REQUEST=KEYMAP, so it is defaulted to text/html. Looking at drawmap.php, it seems that logic is there to generate an appropriate content-typefor the main map, but not for the reference map.
Changed target to 1.99 RC 1.
opps, I suspect this was just an oversight ... to be fixed for RC1.
added in cvs.
one small change added, the imagetype was not getting set in some cases.