[wp-trac] [WordPress Trac] #39128: Customize: Preview fails to load when domain mapping in use (home/siteurl domain mismatch)

[WordPress Trac]

#39128: Customize: Preview fails to load when domain mapping in use (home/siteurl
domain mismatch)
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 Reporter:  RomainVB      |       Owner:
     Type:  defect (bug)  |      Status:  assigned
 Priority:  normal        |   Milestone:  4.7.5
Component:  Customize     |     Version:  4.7
 Severity:  normal        |  Resolution:
 Keywords:  needs-patch   |     Focuses:
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Comment (by jordantrask):

 Hello, the plugin seems to be working, however I'm getting some CSP
 issues.

 about:blank:1 Refused to display
 'customize_changeset_uuid=6d87ad07-d7a0-40e9-a313-a633e95a3800&customize_theme=Divi&customize_messenger_channel=preview-0'
 in a frame because an ancestor violates the following Content Security
 Policy directive: "frame-ancestors https://domain.com".

 Trying to set the frame-ancestors via NGiNX add-header, but it seems like
 something else maybe wordpress is defining "content-security-policy:frame-
 ancestors https://domain.com"

 Just wondering if anyone else is having the issue.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39128#comment:66>
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