Express API postman testing - every request return null

async function getSession(req: Request, res: Response) {
  const headers = req.headers;
  const session = await AuthServices.getSession(headers);
  if(session) {
    return res.status(200).json(session);
  }
  return res.status(404).json({ message: 'No session found' });
}
async function Logout(req: Request, res: Response) {
  await AuthServices.Logout(req.headers);
  return res.status(200).json({ message: 'Logged out successfully' });
}

export const AuthRouter = Router();
AuthRouter.get("/api/v1/session", AuthController.getSession);
AuthRouter.post("/api/v1/logout", AuthController.Logout);

async function getSession (headers: IncomingHttpHeaders) {
  const session = await auth.api.getSession({
    headers: fromNodeHeaders(headers),
  });
    return session;
}
async function LoginEmailAndPassword(email: string, password: string) {
  const loginResult = await auth.api.signInEmail({
    body: {
      email,
      password,
    },
  });
  return loginResult;
}

const db = DB.getInstance().getDB();
export const auth = betterAuth({
  database: mongodbAdapter(db, {
    client: DB.getInstance().getClient(),
  }),
  emailAndPassword: {
    enabled: true,
    requireEmailVerification: false
  },
  plugins: [
    openAPI()
  ]
})

const myHeaders = new Headers();
myHeaders.append("Accept", "application/json");
myHeaders.append("Authorization", "Bearer MY_TOKEN");

const requestOptions = {
  method: "GET",
  headers: myHeaders,
  redirect: "follow"
};

fetch("http://192.168.80.10:4200/api/v1/session", requestOptions)
  .then((response) => response.text())
  .then((result) => console.log(result))
  .catch((error) => console.error(error));