gistfile1.txt

@Sharable object HTTPHandler : SimpleChannelInboundHandler<HttpRequest>() {
	private val files = Object2ObjectArrayMap<String, ByteBuf>(8)

	override fun channelRead0(ctx: ChannelHandlerContext, msg: HttpRequest) {
		val uri = msg.uri()
		var buffer = files[uri]
		if (buffer == null) {
			val bytes = Files.readAllBytes(Paths.get(uri))
			buffer = ctx.alloc().directBuffer(bytes.size)
			buffer.writeBytes(bytes)
			files[uri] = buffer
		}
		ctx.writeAndFlush(buffer!!.retain())
	}
}

@Sharable object HTTPInitializer : ChannelInitializer<SocketChannel>() {
	override fun initChannel(ch: SocketChannel) {
		ch.pipeline().addLast(HttpRequestDecoder()).addLast(HttpResponseEncoder()).addLast(HTTPHandler)
	}
}

fun http(port: Int = 80) = ServerBootstrap().group(group).channel(channel).childHandler(HTTPInitializer).bind(port)