Apache fails to proxy saying "No protocol handler was valid for the URL"

Solution Verified - Updated -

Issue

  • mod_cluster fails to proxy our traffic, returns a 500 response, and yields the following:
[warn] proxy: No protocol handler was valid for the URL /foo. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule.

Environment

  • Apache httpd
    • mod_cluster
    • mod_proxy_balancer
  • JBoss Enterprise Application Platform (EAP)
  • JBoss Enterprise Web Server (EWS)

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