discourse/config/environments/production.rb

Discourse::Application.configure do
  # Settings specified here will take precedence over those in config/application.rb

  # Code is not reloaded between requests
  config.cache_classes = true
  config.eager_load = true

  # Full error reports are disabled and caching is turned on
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true

  # Disable Rails's static asset server (Apache or nginx will already do this)
  config.serve_static_assets = false

  if rails4?
    config.assets.js_compressor  = :uglifier
    config.assets.css_compressor = :sass
  else
    config.assets.compress = true
  end

  # stuff should be pre-compiled
  config.assets.compile = false

  # Generate digests for assets URLs
  config.assets.digest = true

  # Specifies the header that your server uses for sending files
  config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for nginx

  # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
  # the I18n.default_locale when a translation can not be found)
  config.i18n.fallbacks = true

  # specify your smtp url using the SMTP_URL env var eg:
  # SMTP_URL=smtp://user:password@myhost.com
  if ENV.key?('SMTP_URL')
    config.action_mailer.smtp_settings = begin
      uri = URI.parse(ENV['SMTP_URL'])
      params = {
        :address              => uri.host,
        :port                 => uri.port || 25,
        :domain               => (uri.path || "").split("/")[1],
        :user_name            => uri.user,
        :password             => uri.password,
        :authentication       => 'plain',
        :enable_starttls_auto => !ENV['SMTP_DISABLE_TLS']
      }
      CGI.parse(uri.query || "").each {|k,v| params[k.to_sym] = v.first}
      params
    rescue
      raise "Invalid SMTP_URL"
    end
  else
    config.action_mailer.delivery_method = :sendmail
    config.action_mailer.sendmail_settings = {arguments: '-i'}
  end

  # Send deprecation notices to registered listeners
  config.active_support.deprecation = :notify

  # this will cause all handlebars templates to be pre-compiles, making your page faster
  config.handlebars.precompile = true

  # allows admins to use mini profiler
  config.enable_mini_profiler = !ENV["DISABLE_MINI_PROFILER"]

  # Discourse strongly recommend you use a CDN.
  # For origin pull cdns all you need to do is register an account and configure
  config.action_controller.asset_host = ENV["CDN_URL"] if ENV["CDN_URL"]

  # a comma delimited list of emails your devs have
  # developers have god like rights and may impersonate anyone in the system
  # normal admins may only impersonate other moderators (not admins)
  if emails = ENV["DEVELOPER_EMAILS"]
    config.developer_emails = emails.split(",")
  end

end