Removes no-store from Global Caching

Updated Search Controller and Wiki Actions Spec
with Headers

Removed our special application cache header

Fixed Specs for HTTP Headers

app/controllers/application_controller.rb

@@ -66,10 +66,6 @@ class ApplicationController < ActionController::Base
     :manifest_import_enabled?, :phabricator_import_enabled?,
     :masked_page_url
 
-  # Adds `no-store` to the DEFAULT_CACHE_CONTROL, to prevent security
-  # concerns due to caching private data.
-  DEFAULT_GITLAB_CACHE_CONTROL = "#{ActionDispatch::Http::Cache::Response::DEFAULT_CACHE_CONTROL}, no-store"
-
   def self.endpoint_id_for_action(action_name)
     "#{self.name}##{action_name}"
   end
@@ -284,7 +280,6 @@ class ApplicationController < ActionController::Base
 
   def default_cache_headers
     if current_user
-      headers['Cache-Control'] = default_cache_control
       headers['Pragma'] = 'no-cache' # HTTP 1.0 compatibility
     end
   end
@@ -297,14 +292,6 @@ class ApplicationController < ActionController::Base
     headers['Content-Disposition'] = "attachment; filename=\"#{csv_filename}\""
   end
 
-  def default_cache_control
-    if request.xhr?
-      ActionDispatch::Http::Cache::Response::DEFAULT_CACHE_CONTROL
-    else
-      DEFAULT_GITLAB_CACHE_CONTROL
-    end
-  end
-
   def validate_user_service_ticket!
     return unless signed_in? && session[:service_tickets]
 

app/controllers/sessions_controller.rb

@@ -84,6 +84,8 @@ class SessionsController < Devise::SessionsController
   end
 
   def destroy
+    headers['Clear-Site-Data'] = '"cache"'
+
     Gitlab::AppLogger.info("User Logout: username=#{current_user.username} ip=#{request.remote_ip}")
     super
     # hide the signed_out notice

spec/controllers/application_controller_spec.rb

@@ -732,17 +732,8 @@ RSpec.describe ApplicationController do
 
         get :index
 
-        expect(response.headers['Cache-Control']).to eq 'private, no-store'
         expect(response.headers['Pragma']).to eq 'no-cache'
       end
-
-      it 'does not set the "no-store" header for XHR requests' do
-        sign_in(user)
-
-        get :index, xhr: true
-
-        expect(response.headers['Cache-Control']).to eq 'max-age=0, private, must-revalidate'
-      end
     end
   end
 

spec/controllers/search_controller_spec.rb

@@ -315,7 +315,7 @@ RSpec.describe SearchController do
 
         expect(response).to have_gitlab_http_status(:ok)
 
-        expect(response.headers['Cache-Control']).to eq('private, no-store')
+        expect(response.headers['Cache-Control']).to eq('max-age=60, private')
       end
     end
 

spec/requests/admin/version_check_controller_spec.rb

@@ -24,7 +24,7 @@ RSpec.describe Admin::VersionCheckController, :enable_admin_mode do
       end
 
       it 'sets no-cache headers' do
-        expect(response.headers['Cache-Control']).to eq('private, no-store')
+        expect(response.headers['Cache-Control']).to eq('max-age=0, private, must-revalidate')
       end
     end
 
@@ -43,10 +43,7 @@ RSpec.describe Admin::VersionCheckController, :enable_admin_mode do
       end
 
       it 'sets proper cache headers' do
-        # TODO: https://gitlab.com/gitlab-org/gitlab/-/issues/346999
-        # The Cache-Control header is not set correctly for tests
-        # expect(response.headers['Cache-Control']).to eq('max-age=60, private')
-        expect(response.headers['Cache-Control']).to eq('private, no-store')
+        expect(response.headers['Cache-Control']).to eq('max-age=60, private')
       end
     end
   end

spec/support/shared_examples/controllers/wiki_actions_shared_examples.rb

@@ -299,7 +299,7 @@ RSpec.shared_examples 'wiki controller actions' do
           expect(response.headers['Content-Disposition']).to match(/^inline/)
           expect(response.headers[Gitlab::Workhorse::DETECT_HEADER]).to eq('true')
           expect(response.cache_control[:public]).to be(false)
-          expect(response.headers['Cache-Control']).to eq('private, no-store')
+          expect(response.headers['Cache-Control']).to eq('max-age=60, private')
         end
       end
     end