Backported from 1.1 to 1.0.15 fix for WFLY-3385 (when using jsp:in...

WFLY-3385 (when using jsp:include the jsp:param being encoded at the included jsp)

The fix below was made on 1.1.x  branch, I just extracted what was relevant for 1.0.15

https://github.com/undertow-io/undertow/commit/85edc150c558eaa42bae8b2c9869fcc758d39a2c