Description of problem:

jbcs httpd-2.4.23 as reverse proxy for backend websocket server using mod_proxy_wstunnel does not works in either of the use cases.

1] mod_proxy_wstunnel with mod_cluster
2] mod_proxy_wstunnel with mod_proxy_balancer (no mod_cluster modules in use)

Version-Release number of selected component:
jbcs-httpd24-httpd-2.4.23

Steps to Reproduce:
Apache HTTPD configuration

#Load required proxy modules : $HTTPD_HOME/conf.module.d/00-proxy.conf
LoadModule lbmethod_byrequests_module modules/mod_lbmethod_byrequests.so
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_wstunnel_module modules/mod_proxy_wstunnel.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so

#Simple Load Balancing: Create a new file $HTTPD_HOME/conf.d/mod_proxy_wstunnel.conf
<VirtualHost *:80>
ServerName 192.168.122.1

ProxyPreserveHost On

<Proxy balancer://mycluster>
    BalancerMember ws:///192.168.122.1:8080
    BalancerMember ws:///192.168.122.1:8180
</Proxy>


ProxyPass /jboss-websocket-hello balancer://mycluster/jboss-websocket-hello
ProxyPassReverse /jboss-websocket-hello balancer://mycluster/jboss-websocket-hello

<Proxy *>
      Order deny,allow
      Allow from all
</Proxy>
</VirtualHost>

Actual results:
Apache httpd access logs throw HTTP 500 error code for request http://192.168.122.1/jboss-websocket-hello
Apache httpd error logs below error:

[Fri Feb 03 21:09:31.626552 2017] [proxy_wstunnel:debug] [pid 19118] mod_proxy_wstunnel.c(300): [client 192.168.122.1:50684] AH02900: declining URL ws://192.168.122.1:8080/jboss-websocket-hello (not WebSocket)
[Fri Feb 03 21:09:31.626675 2017] [proxy:warn] [pid 19118] [client 192.168.122.1:50684] AH01144: No protocol handler was valid for the URL /jboss-websocket-hello. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule.

Expected results:
The request http://192.168.122.1/jboss-websocket-hello must be successful with HTTP 200 good status code.

Additional info:
This issue does not exist in earlier jbcs httpd version : jbcs-httpd24-httpd-2.4.6 and JBoss Web Server httpd-2.4.6.