1 files changed, 5 insertions, 1 deletions
diff --git a/app/controllers/well_known/host_meta_controller.rb b/app/controllers/well_known/host_meta_controller.rb
index 40f96eaa2..5fb70288a 100644
--- a/app/controllers/well_known/host_meta_controller.rb
+++ b/app/controllers/well_known/host_meta_controller.rb
@@ -1,15 +1,19 @@
 # frozen_string_literal: true
 
 module WellKnown
-  class HostMetaController < ApplicationController
+  class HostMetaController < ActionController::Base
     include RoutingHelper
 
+    before_action { response.headers['Vary'] = 'Accept' }
+
     def show
       @webfinger_template = "#{webfinger_url}?resource={uri}"
 
       respond_to do |format|
         format.xml { render content_type: 'application/xrd+xml' }
       end
+
+      expires_in(3.days, public: true)
     end
   end
 end