Access-Control-Allow-Origin is not working when streaming the data about fastify-cors HOT 6 CLOSED

Why cant you use reply.send(stream)?

from fastify-cors.

I believe nothing it can do on our side.
Do not use reply.raw directly since it bypass all logic we have.
Or do all the thing on your own if you really want to use reply.raw.

from fastify-cors.

See the test i added to the PR #260 on how to do it correct.

from fastify-cors.

Any workaround?

upd: Use custom preHandler hook:

fastify.addHook('preHandler', corsPreHandler)

export const corsPreHandler = (req: FastifyRequest, res: FastifyReply, done: HookHandlerDoneFunction) => {

  const blacklistedPaths = ['/page/:pageParam']
  if (!blacklistedPaths.includes(req.routerPath)) {
    const origin = req.headers.origin ?? ''
    res.header('Access-Control-Allow-Origin', origin)
    res.header('Access-Control-Allow-Methods', '*')
    res.header('Access-Control-Allow-Headers', '*')
  }

  const isPreflight = /options/i.test(req.method)
  if (isPreflight) {
    return res.send()
  }
      
  done()
}

taken from SO

from fastify-cors.

stream.pipe(reply.raw) bypasses all Fastify logic by using reply.raw. Use return stream in your route or reply.send(stream)

from fastify-cors.

Also worked when I did this:

reply
  .type("application/json")
  .header("Access-Control-Allow-Origin", "*")
  .header("Content-Length", fs.statSync(filePath).size);
reply.raw.writeHead(200, reply.getHeaders());
return stream.pipe(reply.raw);

from fastify-cors.