HTTP Header Field X-Frame-Options, October 2013
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To improve the protection of web applications against clickjacking, this document describes the X-Frame-Options HTTP header field, which declares a policy, communicated from the server to the client browser, regarding whether the browser may display the transmitted content in frames that are part of other web pages.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.