Fabric handshake

[Th0rgal]

Hey,

I am looking for an in depth description of the fabric handshake protocol used for checking compatibility between server and client side mods. Is there something similar to https://wiki.vg/Minecraft_Forge_Handshake#FML2_protocol_.281.13_-_Current.29 ?

Best,
Thomas

[Linguardium]

you can handle a login/connection attempt via the ServerLoginConnectionEvents.QUERY_START and sending a query using the LoginPacketSender you get. This lets you send queries to the client to respond to in order to determine compatibility. fabric itself doesnt do a mod list comparison but does handle registry syncing

[modmuss50]

See: #3244 for details on how we send the packet channels during configuration.