Summary

Content-Security-Policy-Report-Only cannot be declared without report-uri directive, because of that it will send the violations to the defined URL.

Content-Security-Policy-Report-Only: script-src 'self'; report-uri https://www.example.com;


Actions To Take
  • If you want to use one of the CSP in report only mode, you should declare with a report-uri

Classifications
OWASP 2013-A5
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