[OpenLayers-Users] applying SLD to WMS raster

[Arnd Wippermann]

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