http://www.rfc-editor.org/rfc/rfc4678.txt
RFC 4678: Server/Application State Protocol v1, A. Bivens2006-09-01T23:00:00-00:00Entities responsible for distributing work across a group of systems traditionally do not know a great deal about the ability of the applications on those systems to complete the work in a satisfactory fashion. Workload management systems traditionally know a great deal about the health of applications, but have little control over the rate in which these applications receive work. The Server/Application State Protocol (SASP) provides a mechanism for load balancers and workload management systems to communicate better ways of distributing the existing workload to the group members. This memo provides information for the Internet community.