Headers is undefined in production mode in NextJS

[Mikey-ShenSu]

What version of Elysia.JS is running?

1.0.7

What platform is your computer?

Darwin 23.4.0 arm64 arm

What steps can reproduce the bug?

import { Elysia, t } from "elysia";

import { swagger } from "@elysiajs/swagger";

const app = new Elysia({ prefix: "/api" })
  .use(swagger())
  .get("/balance", async ({ set, headers }) => {
    console.log(headers);

    return "ok";
  })
  .compile();

export const GET = app.handle;
export const POST = app.handle;
export const PUT = app.handle;
export const DELETE = app.handle;

export type API = typeof app;

{
  "name": "frontend",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "dev": "next dev",
    "build": "next build",
    "start": "next start",
    "lint": "next lint"
  },
  "dependencies": {
    "@elysiajs/swagger": "^1.0.3",
    "elysia": "1.0.7",
    "next": "14.1.3",
    "react": "^18",
    "react-dom": "^18"
  },
  "devDependencies": {
    "@types/node": "^20",
    "@types/react": "^18",
    "@types/react-dom": "^18",
    "eslint": "^8",
    "eslint-config-next": "14.2.1",
    "postcss": "^8",
    "tailwindcss": "^3.4.1",
    "typescript": "^5"
  }
}

What is the expected behavior?

{
  accept: 'application/json, text/plain, */*',
  'accept-encoding': 'gzip, deflate',
  'accept-language': 'en-AU,en;q=0.9',
  connection: 'keep-alive',
  cookie: 'NEXT_LOCALE=en; bearerToken=Bearer eyJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJjaGVja2VyMC5jb20iLCJ1c2VySWQiOiI1M2EyNTA2ZS1iOGQ0LTQzOTAtYWY3ZC0wNzg5NWJjMmMwNDQiLCJ1c2VybmFtZSI6Im1pa2V5NzUifQ.VhBHrKk40Cy8-O9Q8P6hp8SUOkxAOV7Ptyd3gXSTpc8',
  host: 'localhost:3000',
  referer: 'http://localhost:3000/api/swagger',
  'sec-fetch-dest': 'empty',
  'sec-fetch-mode': 'cors',
  'sec-fetch-site': 'same-origin',
  'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4.1 Safari/605.1.15',
  'x-forwarded-for': '::1',
  'x-forwarded-host': 'localhost:3000',
  'x-forwarded-port': '3000',
  'x-forwarded-proto': 'http'
}

What do you see instead?

undefined

Additional information

Code works fine on Dev mode, but not in production. And I have tried Elysia version 1.0.7 and latest, different next version 14.1.3 and latest, and still unable to retrieve the headers.

[luccaparadeda]

Same bug here.