Fabric API

fabric/fabric-networking-api-v1/src/main/java/net/fabricmc/fabric/mixin/networking/ServerLoginNetworkHandlerMixin.java

Lines 75 to 78 in 3f7d361

    
           @Redirect(method = "acceptPlayer", at = @At(value = "INVOKE", target = "Lnet/minecraft/server/MinecraftServer;getNetworkCompressionThreshold()I", ordinal = 0)) 
        
           private int removeLateCompressionPacketSending(MinecraftServer server) { 
        
           	return -1; 
        
           }

This redirect appears to prevent the server from starting the packet compression handshake, so the connection never compresses chunk data. I wasn't able to find any context on why it's needed for the networking code, and the server ran fine with the original implementation replaced.

Is there another piece of code responsible for enabling compression, or is this what it looks like?

This appears to be handled here: https://github.com/FabricMC/fabric/blob/1.18/fabric-networking-api-v1/src/main/java/net/fabricmc/fabric/impl/networking/server/ServerLoginNetworkAddon.java#L74

It sure does! Thanks for checking that, clearly I need to get a better handle on iDEA's search :D

	@Redirect(method = "acceptPlayer", at = @At(value = "INVOKE", target = "Lnet/minecraft/server/MinecraftServer;getNetworkCompressionThreshold()I", ordinal = 0))
	private int removeLateCompressionPacketSending(MinecraftServer server) {
	return -1;
	}

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