How do you use a proxy to avoid CORS in development?
Configure a proxy in your dev server. In Vite: server: { proxy: { '/api': 'https://api.example.com' } }. Requests to /api are proxied to the API server, avoiding CORS (same-origin from the browser's perspective).
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More FAQs in How to Fix CORS Errors in JavaScript
Configure the server to include CORS headers: Access-Control-Allow-Origin (your origin), Access-Control-Allow-Methods, Access-Control-Allow-Headers. Handle OPTIONS preflight with 204. Use the cors middleware in Express. Use a proxy in development.
No. CORS is enforced by the browser based on server headers. You cannot fix it from the client. The server must include the correct CORS headers. In development, use a proxy to avoid CORS entirely.
app.use((req, res, next) => { res.header('Access-Control-Allow-Origin', '*'); res.header('Access-Control-Allow-Methods', 'GET,POST,PUT,DELETE'); res.header('Access-Control-Allow-Headers', 'Content-Type,Authorization'); if (req.method === 'OPTIONS') return res.sendStatus(204); next(); });
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