哪种Ktor方法是正确的-- append()还是buildPacket()？

val buffer = ByteBufAllocator.DEFAULT.buffer()
buffer.writeInt(42)
buffer.append(ByteBufAllocator.DEFAULT.buffer().writeString("Hello"))

val buffer = ByteBufAllocator.DEFAULT.buffer()
buffer.writeInt(42)
val packet = buildPacket(buffer)

import io.ktor.utils.io.*
import io.netty.buffer.ByteBufAllocator

fun main() {
    // 使用 append() 方法
    val buffer = ByteBufAllocator.DEFAULT.buffer()
    buffer.writeInt(42)
    buffer.append(ByteBufAllocator.DEFAULT.buffer().writeString("Hello"))

    // 使用 buildPacket() 方法
    val packetBuffer = ByteBufAllocator.DEFAULT.buffer()
    packetBuffer.writeInt(42)
    val packet = buildPacket(packetBuffer)
}