[wp-trac] [WordPress Trac] #53957: Create a POST API endpoint for rendering legacy widgets

[WordPress Trac]

#53957: Create a POST API endpoint for rendering legacy widgets
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 Reporter:  zieladam      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Core counterpart of [issue
 33540:https://github.com/WordPress/gutenberg/issues/33540] from the
 Gutenberg repo. We need both issues because the API change

 Legacy widgets are rendered using an `<iframe />` with all the attributes
 data URLencoded and packed into `src`.

 This works when there aren't many parameters or when the server tolerates
 very long query strings. Unfortunately, when one of these conditions isn't
 met, we may see an error 414 URI too long.

 To remedy the problem, we need to send the widget attributes outside of
 the query string. POST request body is a reasonable candidate and so this
 ticket is all about adding such an endpoint to the API.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53957>
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