a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS081 [Section] 5.5 [Statement text] 
If the Producer's metadata has set the requiresInitCookie field to any value other than “none”, then the Consumer MUST invoke initCookie and supply any returned cookies according to the semantics of the value of requiresInitCookie as defined in section 4.1.17.
WSRP v2.0 Specification
Statement text