HAProxyCompat

Evidence

Server-side mod: Kiln runs mods' code on Horizon's single-player server, not on dedicated servers.

What it needs from Kiln

• Mixin
• io.netty.buffer.ByteBuf
• io.netty.buffer.DefaultByteBufHolder
• io.netty.buffer.Unpooled
• io.netty.channel.Channel
• io.netty.channel.ChannelHandler
• io.netty.channel.ChannelHandler.Sharable
• io.netty.channel.ChannelHandlerContext
• io.netty.channel.ChannelInboundHandlerAdapter
• io.netty.channel.ChannelPipeline
• io.netty.channel.local.LocalServerChannel
• io.netty.handler.codec.ByteToMessageDecoder
• io.netty.handler.codec.DecoderException
• io.netty.handler.codec.MessageToByteEncoder
• io.netty.handler.codec.ProtocolDetectionResult
• io.netty.util.AbstractReferenceCounted
• io.netty.util.Attribute
• io.netty.util.AttributeKey
• io.netty.util.ByteProcessor
• io.netty.util.CharsetUtil
• io.netty.util.NetUtil
• io.netty.util.ResourceLeakDetector
• io.netty.util.ResourceLeakDetectorFactory
• io.netty.util.ResourceLeakTracker
• io.netty.util.internal.ObjectUtil
• io.netty.util.internal.StringUtil
• net.fabricmc.api.DedicatedServerModInitializer
• net.minecraft.network.Connection
• net.minecraft.network.protocol.status.ClientboundStatusResponsePacket
• net.minecraft.network.protocol.status.ServerStatus
• net.minecraft.network.protocol.status.ServerStatus.Version

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Mixin (0.5)

In the author's words

Restores the real client IP on modded servers behind a reverse proxy (FRP, nginx, HAProxy, Traefik) by reading the PROXY protocol (v1/v2).

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file haproxycompat-1.1.0.jar. The scan reads the mod's classes; it does not run them.