[wp-trac] [WordPress Trac] #54507: Site Editor does not load when using "almost pretty" permalinks

[WordPress Trac]

#54507: Site Editor does not load when using "almost pretty" permalinks
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 Reporter:  noisysocks    |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  5.9
Component:  REST API      |     Version:
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by TimothyBlynJacobs):

 That's unfortunate.

 Yeah the issue with giving these routes URLs based on their resources is
 that a theme identifier can have a slash when a subdirectory theme is in
 use, for instance `theme-experiments/tt1-blocks`, but the template part
 can also have an arbitrary series of slashes.

 This is the problem we were running into originally:
 https://github.com/WordPress/gutenberg/pull/27910/commits/b637fe353b4f2c4763ee59a0ebeb8312baa6172a#r553288550

 Does the "correct" route appear anywhere in `$_SERVER`?

 We may need to figure out a way to percent encode slashes in the theme
 identifier or template parts instead and then transform that back when
 passing the ID to the internal API functions.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54507#comment:4>
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