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You could post the sld to a php-file which writes a sld-file on the server(considering some security aspects). Then you could point to this file: Example: 4 times the same layer, getlegendgraphic with 4 different sld's: ...
This is a Cross Domain Issue as you are calling a different domain in your XMLHttpRequest than is used for the data. I use a simple Proxy on our Server for the XMLHttpRequest from OpenLayers and the Proxy, in turn, forwards the request onto its true destination. An Example of how to make your own Proxy can be seen here This is also discussed here
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