Remove ETag middleware to disable ETag for all requests

app/controllers/users/sessions_controller.rb

@@ -53,14 +53,12 @@ def destroy
     end
 
     def active
-      response.headers['Etag'] = '' # clear etags to prevent caching
       session[:pinged_at] = now
       Rails.logger.debug(alive?: alive?, expires_at: expires_at)
       render json: { live: alive?, timeout: expires_at, remaining: remaining_session_time }
     end
 
     def keepalive
-      response.headers['Etag'] = '' # clear etags to prevent caching
       session[:session_expires_at] = now + Devise.timeout_in if alive?
       analytics.session_kept_alive if alive?
 

config/application.rb

@@ -105,6 +105,8 @@ class Application < Rails::Application
     }
     config.action_mailer.observers = %w[EmailDeliveryObserver]
 
+    config.middleware.delete Rack::ETag
+
     require 'headers_filter'
     config.middleware.insert_before 0, HeadersFilter
     require 'utf8_sanitizer'

spec/controllers/users/sessions_controller_spec.rb

@@ -26,12 +26,6 @@
         expect(response.status).to eq(200)
       end
 
-      it 'clears the Etag header' do
-        get :active
-
-        expect(response.headers['Etag']).to eq ''
-      end
-
       it 'renders json' do
         get :active
 
@@ -675,12 +669,6 @@
         expect(response.status).to eq(200)
       end
 
-      it 'clears the Etag header' do
-        post :keepalive
-
-        expect(response.headers['Etag']).to eq ''
-      end
-
       it 'renders json' do
         post :keepalive