Why this change?
This reverts 725561cf4b as it did not
address the root cause of the problem even though it fixed the failing tests we were seeing
when running `bundle exec rspec --tag ~type:multisite --order random:776 spec/system/admin_customize_form_templates_spec.rb spec/system/admin_sidebar_navigation_spec.rb spec/system/admin_site_setting_search_spec.rb spec/system/composer/dont_feed_the_trolls_popup_spec.rb spec/system/composer/review_media_unless_trust_level_spec.rb spec/system/create_account_spec.rb spec/system/editing_sidebar_tags_navigation_spec.rb spec/system/email_change_spec.rb spec/system/emojis/emoji_deny_list_spec.rb spec/system/group_activity_spec.rb spec/system/hashtag_autocomplete_spec.rb spec/system/network_disconnected_spec.rb spec/system/post_menu_spec.rb spec/system/post_small_action_spec.rb spec/system/tags_intersection_spec.rb spec/system/topic_list_focus_spec.rb spec/system/topic_page_spec.rb spec/system/user_page/user_profile_info_panel_spec.rb spec/system/viewing_group_members_spec.rb spec/system/viewing_navigation_menu_preferences_spec.rb`.
The root cause here is that `before_action`s added to a controller is
order dependent. As such, some requests were not setting the cookie
because the `before_action` callback was not even hit as a prior
`before_action` callbacks has raised an error such as the `check_xhr`
`before_action` callback.
To resolve the problem, we need to add the `prepend: true` option in
our monkey patch of `ApplicationController` to ensure that the
`before_action` callback which we have added is always run first.
This change also makes a couple of changes:
1. Improve the response body when a request is blocked by the `BlockRequestsMiddleware` middleware
so that it makes debugging easier.
2. Only set the cookies for non-xhr HTML format requests. Setting it for
other formats is kind of pointless.
b64a58071d