Have serve-api app and frontend app.

I set access-control-allow-origin on server - development / localhost:3002.

Also i have set app.register(require('fastify-cors'), { origin:true, });

But if i make request from development frontend site with fetch api (localhost on other port 3001)
with post method, chrome says:

Access to fetch at 'http://localhost:3002/login' from origin 'http://localhost:3001' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

But if i make GET request, it works..
Some advice how to solve this?
Thanks!