proxy or gateway between 1.x to 2.x

[muayyad-alsadi]

according to #3007 there is no plan to support backward compatibility between 2.x and 1.x
many people have mobile apps already deployed with varying adoption rate (ex. ios apps needs months to start pushing new app)

if clients (swift or java) can detect server version and act accordingly and there is a commitment to maintain 1.x on those implementations then you can just close this ticket.

if not, then we need a proxy or gateway service that one can run at v1.example.com that passes requests to v2.example.com, otherwise there is no way to maintain apps.

[muayyad-alsadi]

we have implemented this at opensooq and the solution is open-sourced here

https://github.com/OpenSooq/socketio_repeater/

read our blog post

https://engineering.opensooq.com/running-the-incompatible-socket-io-versions-at-the-same-time-is-making-the-impossible-possible/