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While implementing CSP, there are two options.

  1. Implement CSP in the HTTP response header
  2. Implement CSP using a meta tag <meta http-equiv="Content-Security-Policy" content="default-src 'self'">

Out of the above two, which method is more secure and why? Why the other is less secure?

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I would say using headers is marginally more secure than a meta tag because:

  1. Some CSP elements such as report-to/report-uri are not supported in meta tags (see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/report-to for that specific example and following the comment from Fire Quacker, this more general guidance https://cheatsheetseries.owasp.org/cheatsheets/Content_Security_Policy_Cheat_Sheet.html#3-content-security-policy-meta-tag)
  2. Using headers allows a client to view the CSP via a HEAD request without loading the page. This could allow the client to decide not to proceed to a GET request if it did not like the CSP content (I appreciate this may be marginal security benefit, or maybe no real benefit at all in most cases)

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