[wp-trac] [WordPress Trac] #42061: Add new utility function for checking if the current request is a REST API request.

[WordPress Trac]

#42061: Add new utility function for checking if the current request is a REST API
request.
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 Reporter:  lots.0.logs             |       Owner:  flixos90
     Type:  enhancement             |      Status:  assigned
 Priority:  normal                  |   Milestone:  Future Release
Component:  Bootstrap/Load          |     Version:  4.9
 Severity:  normal                  |  Resolution:
 Keywords:  has-patch dev-feedback  |     Focuses:  rest-api
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Comment (by iandunn):

 Replying to [comment:7 flixos90]:
 > REST is controlled by a query variable...
 > It is therefore impossible to detect a REST request before the
 `parse_request` action, at least with the means currently in place...
 > We could find a way to detect a REST request through another way and aim
 for making the process similar to AJAX and Cron so that it can be detected
 really early.

 I think that'd be ideal. One benefit would be that `WP_USE_THEMES` could
 be set to `false` for REST API requests, and `wp_using_themes()` could be
 used to [https://wordpress.stackexchange.com/questions/332854/detect-
 front-end-pages-only-in-init-hook detect the front end] before
 `template_redirect` executes.

 One way to do that might be something like
 [https://github.com/woocommerce/woocommerce/pull/21090/files#diff-
 7a990aa0f401ec3e7e8a62c6b23d8b3eR230 the solution that Woo experiment
 with]. I haven't looked deeply to see if there are cases where that
 wouldn't work, though.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42061#comment:15>
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