after apply mergeNewParams try to get the url of your request with map.layers[3].grid[1][1].url. you can also try window.open(map.layers[3].grid[1][1].url); to open the url in a new tab. the request should give you a hint what may be wrong. most likely your responsed sld have linefeeds in it. You have to delete them before apply the sld. Arnd
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