Small correction to my previous answer, Elastic Beanstalk will support ALB in the very near future.

Great. I'm looking forward to the day when I can retire my hacky workarounds to facilitate websockets on Elastic Beanstalk.

Out of curiosity, what are these workarounds ?

TCP load balancing with a modified nginx config that forwards the websocket upgrade header

Are we talking days or weeks ?

I guess weeks because it's still not supported.