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I'm trying to access a webservice that returns a map image in different formats. It first always returns a .png file until I hit the refresh button. It then returns me the map in the correct format. Do you know what could cause that? Thank you.

http://appserver/ArcGIS/services/City/MapServer/WMSServer?REQUEST=GetMap&Version=1.1.1&LAYERS=0,2,3,4,5,7,8,9,10,11,12,13&SRS=4326&FORMAT=jpeg&BBOX=43.999861,32.999861,45.000139,34.000139&WIDTH=500&Height=500&Styles=

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Which refresh button are you hitting? The one in ArcGIS Server Manager, or the one in your browser? –  mwalker Mar 21 '11 at 20:38
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Which browser are you using? I tried a similar query on ArcGIS online servers as well as my servers & it returns different formats, every time I change the 'FORMAT'. Can you clarify your question further? –  Devdatta Tengshe Mar 23 '11 at 3:01
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