The Content-Security-Policy-Report-Only header field lets servers experiment with policies by monitoring (rather than enforcing) a policy. (W3C TR http://www.w3.org/TR/CSP2: Content Security Policy Level 2)

The Content-Security-Policy-Report-Only HTTP response header field allows web developers to experiment with policies by monitoring (but not enforcing) their effects. (W3C TR http://www.w3.org/TR/CSP3: Content Security Policy Level 3)


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