a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS005 [Section] 2.13 [Statement text] 
Since the transport layer is often used to store various pieces of information (e.g. J2EE load balancing depends on a session cookie and HTTP transport), and these pieces of information often will pertain to a client session with the Consumer rather than the Consumer itself, Consumers that manage transport layer issues, such as cookies, MUST return them to the Producer only for subsequent invocations within the Markup Interface during the same client session.
WSRP v2.0 Specification
Statement text