Refactor Cache-Control and Vary definitions (#24347)

app/controllers/well_known/host_meta_controller.rb

@@ -1,11 +1,9 @@
 # frozen_string_literal: true
 
 module WellKnown
-  class HostMetaController < ActionController::Base
+  class HostMetaController < ActionController::Base # rubocop:disable Rails/ApplicationController
     include RoutingHelper
 
-    before_action { response.headers['Vary'] = 'Accept' }
-
     def show
       @webfinger_template = "#{webfinger_url}?resource={uri}"
       expires_in 3.days, public: true

app/controllers/well_known/nodeinfo_controller.rb

@@ -1,11 +1,9 @@
 # frozen_string_literal: true
 
 module WellKnown
-  class NodeInfoController < ActionController::Base
+  class NodeInfoController < ActionController::Base # rubocop:disable Rails/ApplicationController
     include CacheConcern
 
-    before_action { response.headers['Vary'] = 'Accept' }
-
     def index
       expires_in 3.days, public: true
       render_with_cache json: {}, serializer: NodeInfo::DiscoverySerializer, adapter: NodeInfo::Adapter, expires_in: 3.days, root: 'nodeinfo'

app/controllers/well_known/webfinger_controller.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 module WellKnown
-  class WebfingerController < ActionController::Base
+  class WebfingerController < ActionController::Base # rubocop:disable Rails/ApplicationController
     include RoutingHelper
 
     before_action :set_account
@@ -34,7 +34,12 @@ module WellKnown
     end
 
     def check_account_suspension
-      expires_in(3.minutes, public: true) && gone if @account.suspended_permanently?
+      gone if @account.suspended_permanently?
+    end
+
+    def gone
+      expires_in(3.minutes, public: true)
+      head 410
     end
 
     def bad_request
@@ -46,9 +51,5 @@ module WellKnown
       expires_in(3.minutes, public: true)
       head 404
     end
-
-    def gone
-      head 410
-    end
   end
 end