## Problem

I'm trying to set cookies from my Railway backend and redirect to my localhost frontend during development, but cookies are not being saved in the browser.

## Environment

- **Backend**: NestJS + Fastify on Railway (HTTPS)
- **Frontend**: Next.js on localhost:8000 (HTTP)
- **Flow**: Email verification → Railway backend sets cookie → Redirect to localhost

## Current Setup

### Backend (Railway)
```typescript
// Cookie options
{
  path: '/',
  httpOnly: true,
  sameSite: 'none',
  secure: true
}

// CORS config
{
  origin: 'http://localhost:8000',
  credentials: true
}

// After email verification
reply.setCookie('accessToken', token, cookieOptions);
return reply.status(302).redirect('http://localhost:8000/callback/signup');