WebSocket close code always 1005

[den9yon9]

Version: Deno 2.1.4

Deno.serve({ port: 8000, hostname: "127.0.0.1" }, (req) => {
  const { socket, response } = Deno.upgradeWebSocket(req);
  socket.addEventListener("close", (e) => {
    // e.code always 1005
    console.log(`server socket close code: ${e.code}`);
  });
  return response;
});

const socket = new WebSocket("ws://127.0.0.1:8000");

setTimeout(() => {
  socket.close(1000);
}, 3000);

socket.addEventListener("close", (e) => {
  // e.code always 1005
  console.log(`client socket close code: ${e.code}`);
});

[siaeyy]

What's more interesting is that if you specify the reason parameter, the code will be handled properly.