Add cache headers to static files served through Rails (#24120)

config/environments/development.rb

@@ -16,12 +16,7 @@ Rails.application.configure do
   # Run rails dev:cache to toggle caching.
   if Rails.root.join('tmp/caching-dev.txt').exist?
     config.action_controller.perform_caching = true
-
     config.cache_store = :redis_cache_store, REDIS_CACHE_PARAMS
-
-    config.public_file_server.headers = {
-      'Cache-Control' => "public, max-age=#{2.days.to_i}",
-    }
   else
     config.action_controller.perform_caching = false
     config.cache_store = :null_store

config/environments/production.rb

@@ -19,24 +19,14 @@ Rails.application.configure do
   # or in config/master.key. This key is used to decrypt credentials (and other encrypted files).
   # config.require_master_key = true
 
-  # Disable serving static files from the `/public` folder by default since
-  # Apache or NGINX already handles this.
-  config.public_file_server.enabled = ENV['RAILS_SERVE_STATIC_FILES'].present?
-
   ActiveSupport::Logger.new(STDOUT).tap do |logger|
     logger.formatter = config.log_formatter
     config.logger = ActiveSupport::TaggedLogging.new(logger)
   end
 
-  # Compress JavaScripts and CSS.
-  # config.assets.js_compressor = Uglifier.new(mangle: false)
-  # config.assets.css_compressor = :sass
-
   # Do not fallback to assets pipeline if a precompiled asset is missed.
   config.assets.compile = false
 
-  # `config.assets.precompile` and `config.assets.version` have moved to config/initializers/assets.rb
-
   # Specifies the header that your server uses for sending files.
   config.action_dispatch.x_sendfile_header = ENV['SENDFILE_HEADER'] if ENV['SENDFILE_HEADER'].present?
 
@@ -66,7 +56,7 @@ Rails.application.configure do
 
   # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
   # English when a translation cannot be found).
-  config.i18n.fallbacks = [:en]
+  config.i18n.fallbacks = true
 
   # Send deprecation notices to registered listeners.
   config.active_support.deprecation = :notify

config/environments/test.rb

@@ -12,11 +12,6 @@ Rails.application.configure do
   # preloads Rails for running tests, you may have to set it to true.
   config.eager_load = false
 
-  # Configure public file server for tests with Cache-Control for performance.
-  config.public_file_server.enabled = true
-  config.public_file_server.headers = {
-    'Cache-Control' => "public, max-age=#{1.hour.to_i}"
-  }
   config.assets.digest = false
 
   # Show full error reports and disable caching.