admin_bar_deliver in core/modules/admin_bar/admin_bar.module

Delivery callback for client-side HTTP caching.

backdrop_deliver_html_page in core/includes/common.inc

Packages and sends the result of a page callback to the browser as HTML.

backdrop_json_deliver in core/includes/common.inc

Packages and sends the result of a page callback to the browser as JSON.

drupal_page_footer in core/includes/drupal.inc

Performs end-of-request tasks.

redirect_goto in core/modules/redirect/redirect.module

Redirect callback; perform an URL redirect.

system_token_browser_output in core/modules/system/system.pages.inc

Token browser JSON endpoint delivery callback.