ProxyPreserveHost On
ProxyPass / http://127.0.0.1:5678/
ProxyPassReverse / http://127.0.0.1:5678/

RewriteEngine On
RewriteCond %{HTTP:Upgrade} =websocket [NC]
RewriteRule /(.*) ws://127.0.0.1:5678/$1 [P,L]
RewriteCond %{HTTP:Upgrade} !=websocket [NC]
RewriteRule /(.*) http://127.0.0.1:5678/$1 [P,L]