Enable CORS

Enabling CORS is required if you want to allow serving HTTP request to external clients. For example, if you want to expose an API to some consumers: JS libraries, headless clients, and so on.

To enable CORS, you can use the with-cors middleware in two different ways.

You can simply call it in your handler:

import withCors from '~/core/middleware/with-cors'; function apiHandler( req: NextApiRequest, res: NextApiResponse ) { withCors(res); // your logic } export default apiHandler;

Alternatively, you can use it with withPipe:

import withCors from '~/core/middleware/with-cors'; function handler( req: NextApiRequest, res: NextApiResponse ) { // your logic } export default withPipe( withCors, apiHandler );

Additionally, you need to respond to OPTIONS request appropriately.

export function handler( req: NextApiRequest, res: NextApiResponse ) { withCors(res); if (req.method === `OPTIONS`) { // add the method you want to allow res.setHeader('Access-Control-Allow-Methods', 'GET'); return res.end(); } }

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