Pulled

https://github.com/tootsuite/mastodon/commit/6e9e8d89fa0dbfe9c3c683c7e7dede8a54d3b6d3

app/controllers/auth/registrations_controller.rb

@@ -9,6 +9,7 @@ class Auth::RegistrationsController < Devise::RegistrationsController
   before_action :set_sessions, only: [:edit, :update]
   before_action :set_instance_presenter, only: [:new, :create, :update]
   before_action :set_body_classes, only: [:new, :create, :edit, :update]
+  before_action :set_cache_headers, only: [:edit, :update]
 
   def new
     super(&:build_invite_request)
@@ -102,4 +103,8 @@ class Auth::RegistrationsController < Devise::RegistrationsController
   def set_sessions
     @sessions = current_user.session_activations
   end
+
+  def set_cache_headers
+    response.headers['Cache-Control'] = 'no-cache, no-store, max-age=0, must-revalidate'
+  end
 end