Apache 无法代理，称"No protocol handler was valid for the URL"
Issue
- mod_cluster 无法代理我们的流量，返回一个 500 响应，并产生以下消息：
[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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