Secure and httponly options on cookie.

config/initializers/session_store.rb

 # Be sure to restart your server when you modify this file.
 
-Gitlab::Application.config.session_store :cookie_store, key: '_gitlab_session'
+Gitlab::Application.config.session_store :cookie_store, key: '_gitlab_session',
+                                                      secure: Gitlab::Application.config.force_ssl,
+                                                      httponly: true
 
 # Use the database for sessions instead of the cookie-based default,
 # which shouldn't be used to store highly confidential information