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https://issues.apache.org/jira/browse/NIFI-5366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16599008#comment-16599008
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Andy LoPresto commented on NIFI-5366:
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I'd read [this StackOverflow answer|https://stackoverflow.com/a/40417609/70465]
to see how they interact. It appears that the {{frame-ancestors}} CSP obsoletes
the {{X-Frame-Options}} header, but some legacy browsers rely on the header.
> Implement Content Security Policy frame-ancestors directive
> -----------------------------------------------------------
>
> Key: NIFI-5366
> URL: https://issues.apache.org/jira/browse/NIFI-5366
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Affects Versions: 1.7.0
> Reporter: Andy LoPresto
> Assignee: Nathan Gough
> Priority: Major
> Labels: frame, header, http, security
>
> The {{X-Frame-Options}} headers [1] currently in place to prevent malicious
> framing / clickjacking [2] are superseded by and should be replaced by the
> Content Security Policy frame-ancestors [3] directive.
> [1] https://tools.ietf.org/html/rfc7034
> [2] https://en.wikipedia.org/wiki/Clickjacking
> [3]
> https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-ancestors
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