Andrew Ozz 67b2ff7bc3 REST API: Add support for continuing the post-processing of images after upload. Flow:
1. `POST /wp/v2/media`.
2. If the upload failed (HTTP 500 error), look for a response header with `X-WP-Upload-Attachment-ID` header that contains the newly created attachment ID.
3. `POST /wp/v2/media/{id}/post-process` with `{ "action": "create-image-subsizes" }`. This request may still fail, but it will save its progress.
4. On continued failure, `DELETE /wp/v2/media/{id}` to give up on the upload and instruct the user to resize their image before uploading.

Props TimothyBlynJacobs.
Fixes #47987.
Built from https://develop.svn.wordpress.org/trunk@46422


git-svn-id: http://core.svn.wordpress.org/trunk@46220 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-07 17:06:03 +00:00
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