import asyncdispatch, asyncnet, strutils

var socket = newAsyncSocket()

proc loop(socket: AsyncSocket) {.async.} =
  while true:
    let client_socket = await socket.accept()
    let size = 40_000_000
    let some_file = repeat("0", size)
    asyncCheck client_socket.send("HTTP/1.1 200 OK\r\nContent-Type: application/zip" &
        "\r\nContent-Length: " & $size &
        "\r\nCache-Control: no-store\r\nConnection: Close\r\n\r\n" & some_file)
    GC_fullCollect() #Using this leads to less memory usage

socket.bindAddr(8080.Port)
socket.listen()
waitFor loop(socket)