XEL Utilities that depends on Servlets.
It is designed to make the signature of XEL functions (see org.zkoss.web.fn.ServletFns ) simpler. For example, org.zkoss.web.fn.ServletFns.isExplorer requires no argument, since it assumes the current context can be retrieved from RequestContexts.getCurrent .
Spec Issue: It is controversial whether the introduction of RequestContext and RequestContexts is worth.