a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS190 [Section] 9.2.1.1.3.6 [Statement text] 
This restriction increases the cacheability of the resource over specifying a value of "page" (e.g. for the duration of a user interacting with some other portlet), but the generated resource MUST NOT include URIs with a wsrp-urlType of render or blockingAction.
WSRP v2.0 Specification
Statement text