[wp-trac] [WordPress Trac] #40919: REST API: Allow overriding `jQuery.ajax` calls from within wp-admin

[WordPress Trac]

#40919: REST API: Allow overriding `jQuery.ajax` calls from within wp-admin
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 Reporter:  jnylen0                               |      Owner:
     Type:  enhancement                           |     Status:  new
 Priority:  normal                                |  Milestone:  4.8.1
Component:  REST API                              |    Version:  trunk
 Severity:  normal                                |   Keywords:  has-patch
  Focuses:  javascript, administration, rest-api  |
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 In WP 4.8, there are now 3 places where we call out to the REST API from
 within wp-admin (see attached patch for details):

 - When viewing the settings for the video widget, to load a video preview.
 - When editing the settings for a video widget in the media modal, to load
 a video preview.
 - When embedding from a URL in the post editor, to load an oEmbed preview.

 These all call `jQuery.ajax` directly.  We need to avoid this going
 forward because it is impossible to override.  I am aware of one large,
 customized WordPress installation ''cough'' where we will need to put this
 change in place as a core hack.  (jQuery has
 [http://api.jquery.com/jquery.ajaxprefilter/ functionality to override
 AJAX request options] but this is not sufficient due to the way cross-
 domain API requests work on WP.com.)

 There are other benefits as well, such as testability (this wrapper will
 provide a cleaner way to mock these API responses) and extensibility (this
 will be a natural place to add a filter when #21170 lands).

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Ticket URL: <https://core.trac.wordpress.org/ticket/40919>
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