[wp-trac] [WordPress Trac] #64171: Cache failed requests to WordPress.org API endpoints

[WordPress Trac]

#64171: Cache failed requests to WordPress.org API endpoints
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 Reporter:  peterwilsoncc  |      Owner:  (none)
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  General        |    Version:
 Severity:  normal         |   Keywords:
  Focuses:  performance    |
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 WordPress does not cache failed responses to various WordPress.org API
 endpoints (theme & plugin updates, etc).

 When disconnected from a network this significantly impacts the
 performance of the dashboard as the requests are repeated as the user
 navigates:

 * Main dashboard page: 2 requests leading to 20 second delay
 * Ajax request to planet WP: 10 seconds delay, non blocking
 * Plugin dashboard page: 2 requests to the same endpoint, 20 second delay
 * Theme dashboard page: 2 requests to the same endpoint, 20 second delay
 * Updates dashboard page: 6 requests (3 repeated), 60 second delay
 * Site health dashboard page: 1 blocking request, 10 second delay
 * Site health dotorg-communication endpoint: 20 second delay
 * Site health debug page: 7 blocking requests, 70 second delay

 Successful requests to most endpoints are cached for twelve hours, I think
 it would be wise to cache unsuccessful requests for some amount of time
 but probably a little less. 6 hours maybe???

 For the site health screens, it may be wise to force uncached requests so
 up-to-date information is known but this ought to occur via the site's
 REST API so the requests are non blocking.

 I picked this up while testing [https://github.com/WordPress/wordpress-
 develop/pull/7350 PR#7350].


 To reproduce:

 1. Configure WordPress locally.
 2. Disconnect your computer from the network
 3. Run the WP CLI commands: `wp transient delete --all; wp transient
 delete --all --network; wp cache flush`
 4. Navigate around the WordPress admin

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Ticket URL: <https://core.trac.wordpress.org/ticket/64171>
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