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https://api.drupal.org/api/drupal/includes%21common.inc/function/drupal_deliver_page/7.x
This default can be overridden on a per menu router item basis by setting 'delivery callback' in hook_menu() or hook_menu_alter(), and can also be overridden on a per request basis in hook_page_delivery_callback_alter(). For example, the same page callback function can be used for an HTML version of the page and an Ajax version of the page.
https://www.hashbangcode.com/article/drupal-7-page-delivery-callbacks
Or, how you can render a Drupal page with an entirely different template. I recently had a requirement where I needed to get Drupal to render a single page of HTML that was entirely separate from the normal page layout of a site. This was actually part of an API callback, but this got me involved in looking at how delivery callbacks work in Drupal 7.
https://www.drupal.org/node/1937056
Mar 08, 2013 · hook_page_delivery_callback_alter() Drupal 7 provided hook_page_delivery_callback_alter to enable modules to change the delivery callback mid-request "based on information unrelated to the path of the page accessed. For example, it can be used to set the delivery callback based on a HTTP request header…".
https://api.drupal.org/api/drupal/includes%21ajax.inc/function/ajax_deliver/7.x
function ajax_deliver. Packages and sends the result of a page callback as an Ajax response. This function is the equivalent of drupal_deliver_html_page(), but for Ajax requests. Like that function, it: ... hook_page_delivery_callback_alter in modules/ system/ system.api.php
https://www.drupal.org/project/drupal/issues/1622934
Jun 08, 2012 · hook_page_delivery_callback_alter() No longer working. Only used by the Overlay, in core. overlay_page_delivery_callback_alter() and overlay_deliver_empty_page() Used by the overlay to just show an empty page in the overlay, when it should close after a form submit.
https://drupal.stackexchange.com/questions/108966/would-redirecting-users-in-hook-menus-access-callback-have-any-undesirable-effe
I think you could do this by altering the delivery callback function. If the access callback returns FALSE that's what's passed to the delivery callback. If you wanted this redirect behaviour just on specific pages you could modify the delivery callback just for those pages via hook_menu() or hook_menu_alter().If you want the behaviour to be global, you can use a hook_page_delivery_callback ...
https://drupal.stackexchange.com/questions/57554/which-hook-do-i-need-to-use-to-pull-external-content-in-pages
hook_page_alter() is used to alter the page returned from another module, and hook_page_delivery_callback_alter() is used to change the page delivery callback for a page output from another module. All the hooks with a name ending with _alter are hooks that alter the output of another module, what another module returns, or the data stored by ...
https://gist.github.com/SebCorbin
GitHub Gist: star and fork SebCorbin's gists by creating an account on GitHub.Home Country: Nantes, France
https://www.unmoscerinonelweb.com/blog/tag/drupal-7/page/2/
To achieve a better solution, my suggestion is to modify the Drupal variable x_frame_options before the drupal_deliver_html_page is called. I did this (and it works like charme) via page_delivery_callback_alter, where I set the variable to FALSE under certain satisfited conditions (i.e. the page is requested from a whitelist domain).
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