[wp-trac] [WordPress Trac] #30143: Using admin-ajax from the frontend

[WordPress Trac]

#30143: Using admin-ajax from the frontend
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 Reporter:  lukecarbis                         |      Owner:
     Type:  enhancement                        |     Status:  new
 Priority:  normal                             |  Milestone:  Awaiting
Component:  General                            |  Review
 Severity:  normal                             |    Version:
  Focuses:  javascript, template, performance  |   Keywords:
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 WP Ajax should not be used from the frontend because responses from
 `admin-ajax.php` are not cached (including `nocache_headers()`). Also, it
 has `admin` and `.php` in the URL.

 Instead, we should add a query var, and then do the `template_include`
 routine to select a template that returns JSON. This would also makes
 sites more RESTful.

 I've put together a bit of an idea of how this should work here:
 https://gist.github.com/lukecarbis/6180629d7936d4b0a7eb

 This routine is something that we could put in the docs, however, if parts
 of this were implemented in core it would make things a lot simpler for
 everyone.

 My suggestion is to add `wp_ajax_action` to the default query vars, and
 ajax callbacks inside the template loader (see the gist above for an
 example).

 (props @westonruter for some help putting this together)

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Ticket URL: <https://core.trac.wordpress.org/ticket/30143>
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