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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.

The code to enable CORS in Remix is very simple. In fact, you can enable it using the following code:

function withCors() {
  const headers = new Headers();

  headers.append('Access-Control-Allow-Origin', '*');

  headers.append(
    'Access-Control-Allow-Headers',
    'Origin, X-Requested-With, Content-Type, Accept, referer-path'
  );

  return headers;
}

Additionally, you need to handle OPTIONS requests appropriately.

if (request.method === `OPTIONS`) {
  return new Response(null, {
    headers: {
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Methods': 'GET, HEAD, POST, PUT, DELETE',
    },
  });
}

In your Makerkit codebase, this function is already available in the ~/core/middleware/with-cors.ts file.

To enable CORS, you can simply call it in your handler. If it fails, it will throw an exception with the appropriate HTTP status code.

import withCors from '~/core/middleware/with-cors';

export const action: ActionFunction = async ({}) => {
  withCors();
  // your logic
}

export default apiHandler;

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