a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS225 [Section] 5.3 [Statement text] 
When the Portlet offers a choice to the Consumer between using the getResource operation or the HTTP proxy method to retrieve the resource, the resource served to the End-User SHOULD NOT depend on how the Consumer chooses to retrieve the resource.
WSRP v2.0 Specification
Statement text