como resolver Access-Control-Allow-Origin en symfony3

https://ourcodeworld.com/articles/read/291/how-to-solve-the-client-side-access-control-allow-origin-request-error-with-your-own-symfony-3-api


nelmio_cors:
        defaults:
            allow_credentials: false
            allow_origin: []
            allow_headers: []
            allow_methods: []
            expose_headers: []
            max_age: 0
            hosts: []
            origin_regex: false
        paths:
            '^/api':
                allow_origin: ['*']
                allow_headers: ['*']
                allow_methods: ['POST', 'PUT', 'GET', 'DELETE']
                max_age: 3600