Add all other headers

Author: naiyt

lib/secure_headers/railtie.rb

@@ -3,7 +3,12 @@
   module SecureHeaders
     class Railtie < Rails::Engine
       isolate_namespace ::SecureHeaders if defined? isolate_namespace # rails 3.0
-      conflicting_headers = ['X-Frame-Options', 'X-XSS-Protection', 'X-Content-Type-Options']
+      conflicting_headers = ['X-Frame-Options', 'X-XSS-Protection', 'X-Content-Type-Options',
+                             'X-Permitted-Cross-Domain-Policies', 'X-Download-Options',
+                             'X-Content-Type-Options', 'Strict-Transport-Security',
+                             'Content-Security-Policy', 'Content-Security-Policy-Report-Only',
+                             'X-Permitted-Cross-Domain-Policies']
+
       initializer "secure_headers.action_controller" do
         ActiveSupport.on_load(:action_controller) do
           include ::SecureHeaders