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Content Security Policies (CSPs) and Cloudflare

A Content Security Policy (CSP) is an added layer of security that helps detect and mitigate certain types of attacks, including:

  • Content/code injection
  • Cross-site scripting (XSS)
  • Embedding malicious resources
  • Malicious iframes (clickjacking)

To learn more about configuring a CSP in general, refer to the Mozilla documentation.

​​ Using a CSP with Cloudflare

Cloudflare’s CDN is compatible with CSP.

Cloudflare does not:

  • Modify CSP headers from the origin web server.
  • Require changes to acceptable sources for first or third-party content.
  • Modify URLs (besides adding the /cdn-cgi/ endpoint).
  • Interfere with locations specified in your CSP.

​​ Product requirements

To use certain Cloudflare features, however, you may need to update the headers in your CSP:

Feature(s) Updated headers
Rocket Loader, Mirage script-src 'self';
Cloudflare Apps, Scrape Shield script-src 'self' 'unsafe-inline'
Web Analytics script-src; connect-src
Bot products Refer to JavaScript detections and CSPs.
Page Shield Refer to Page Shield CSP Header format.
Zaraz No updates required ( details).
Turnstile Refer to Turnstile FAQ.