```ruby
# Be sure to restart your server when you modify this file.

# Avoid CORS issues when API is called from the frontend app.
# Handle Cross-Origin Resource Sharing (CORS) in order to accept cross-origin AJAX requests.

# Read more: https://github.com/cyu/rack-cors

#Rails.application.config.middleware.insert_before 0, Rack::Cors do
#  allow do
#    origins '*'
#    resource '*',
#      headers: :any,
#      methods: [:get, :post, :put, :patch, :delete, :options, :head],
#      expose: ['client', 'uid', 'access-token']
#  end
#end
```

Allow cross origin only in development
user
```ruby
# Be sure to restart your server when you modify this file.

# Avoid CORS issues when API is called from the frontend app.
# Handle Cross-Origin Resource Sharing (CORS) in order to accept cross-origin AJAX requests.

# Read more: https://github.com/cyu/rack-cors

if Rails.env.development?
  Rails.application.config.middleware.insert_before 0, Rack::Cors do
    allow do
      origins '*'
      resource '*',
        headers: :any,
        methods: [:get, :post, :put, :patch, :delete, :options, :head],
        expose: ['client', 'uid', 'access-token']
    end
  end
end
```
assistant