```ruby
# config/initializers/graphql_playground.rb
# All config options have a default that should work out of the box
GraphqlPlayground::Rails.configure do |config|
  # config.headers = {
  #   'X-Auth-Header' => ->(view_context) { "123" }
  # }
  # config.title = "Playground"
  # config.csrf = true
  # config.playground_version = "latest"
  # # Ideally the assets would be added to your projects `vendor/assets` directories
  # config.favicon = "/assets/playground.ico"
  # config.playground_js_url = "/assets/playground.js"
  # config.playground_css_url = "/assets/playground.css"
  # # see: https://github.com/prisma-labs/graphql-playground#settings
  config.settings = {
    "schema.polling.enable": false
  }
end
```

Fix production server not running due to config of dev gem
user
```ruby
# config/initializers/graphql_playground.rb
# All config options have a default that should work out of the box
if Rails.env.development?
  GraphqlPlayground::Rails.configure do |config|
    # config.headers = {
    #   'X-Auth-Header' => ->(view_context) { "123" }
    # }
    # config.title = "Playground"
    # config.csrf = true
    # config.playground_version = "latest"
    # # Ideally the assets would be added to your projects `vendor/assets` directories
    # config.favicon = "/assets/playground.ico"
    # config.playground_js_url = "/assets/playground.js"
    # config.playground_css_url = "/assets/playground.css"
    # # see: https://github.com/prisma-labs/graphql-playground#settings
    config.settings = {
      "schema.polling.enable": false
    }
  end
end
```
assistant