backdrop_add_http_header in core/includes/bootstrap.inc

Sets an HTTP response header for the current page.

backdrop_page_header in core/includes/bootstrap.inc

Sets HTTP headers in preparation for a page response.

backdrop_serve_page_from_cache in core/includes/bootstrap.inc

Sets HTTP headers in preparation for a cached page response.

drupal_send_headers in core/includes/drupal.inc

Sends the HTTP response headers that were previously set, adding defaults.

file_download_page in core/modules/file/file.pages.inc

Menu callback; download a single file entity.

file_transfer in core/includes/file.inc

Transfers a file to the client using HTTP.