[wp-trac] [WordPress Trac] #48283: Cron: 'Headers already sent' warning with `ALTERNATE_WP_CRON`

[WordPress Trac]

#48283: Cron: 'Headers already sent' warning with `ALTERNATE_WP_CRON`
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 Reporter:  dlh           |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Cron API      |    Version:  trunk
 Severity:  normal        |   Keywords:  has-patch
  Focuses:                |
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 After [45560], a "Headers already sent" warning is generated when
 `ALTERNATE_WP_CRON` is enabled. The cause seems to be that `spawn_cron()`
 adds headers via `wp_redirect()` and then sends headers before loading
 `wp-cron.php`.

 The attached patch would add a `headers_sent()` check before the two
 caching headers.

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Ticket URL: <https://core.trac.wordpress.org/ticket/48283>
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