a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS133 [Section] 9.2.1 [Statement text] 
The Consumer is NOT REQUIRED to process escaped characters in parameter names, but rather MAY pass them unchanged to either the user-agent (during URL rewriting) or the Producer (during processing of an activated URL).
WSRP v2.0 Specification
Statement text