```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 'tebukuro.shinosakarb.org', 'localhost:4000'

    resource '*',
      headers: :any,
      credentials: true,
      expose: ['access-token', 'expiry', 'token-type', 'uid', 'client'],
      methods: [:get, :post, :delete, :patch]
  end
end
```

Switch allowed frontend origin by rails environment
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

Rails.application.config.middleware.insert_before 0, Rack::Cors do
  allow do
    origins Rails.env.development? ?  'localhost:4000' : 'tebukuro.shinosakarb.org'

    resource '*',
      headers: :any,
      credentials: true,
      expose: ['access-token', 'expiry', 'token-type', 'uid', 'client'],
      methods: [:get, :post, :delete, :patch]
  end
end
```
assistant