Web-app Lifecycle Control

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Traditional httpd-based load balancers do not handle web application undeployments particularly well. From the proxy's perspective requests to an undeployed web application are indistinguishable from a request for an non-existent resource, and will result in 404 errors. In mod_cluster, each server forwards any web application context lifecycle events (e.g. web-app deploy/undeploy) to the proxy informing it to start/stop routing requests for a given context to that server.