If you have Apache >= 2.4 and enabled proxy_wstunnel, then this example may help to show how to redirect websockets connections to the right place. (Note that there are easier ways if you want to redirect all traffic to the websocket location. This example is for if you want to have the normal HTTP side-by-side with the websockets.)

[...]
RewriteCond %{HTTP:Upgrade} websocket [NC]
RewriteRule /(.*) ws://localhost:1234/$1 [P,L]
[...]