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Unlike a lot of the scripted versions of objects across the system, there is no direct access to the ProfileRequestContext tree that exposes the state of the request. However, it's easy to get access to it by using a servlet request attribute named "opensamlProfileRequestContext". You can inject the servlet request object through the customObjectRef hook (set ; Set it to "shibboleth.HttpServletRequest" (or "shibboleth.HttpServletRequestSupplier" in V4.3 and later as per this link).