ProxyPreserveHost On
ProxyRequests Off

ProxyPass /api/websocket ws://localhost:8123/api/websocket
ProxyPassReverse /api/websocket ws://localhost:8123/api/websocket
ProxyPass / http://localhost:8123/
ProxyPassReverse / http://localhost:8123/

RewriteEngine on
RewriteCond %{HTTP:Upgrade} =websocket [NC]
RewriteRule /(.*)  ws://localhost:8123/$1 [P,L]
RewriteCond %{HTTP:Upgrade} !=websocket [NC]
RewriteRule /(.*)  http://localhost:8123/$1 [P,L]