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How to help prevent hotlinking using referer checking, AWS WAF, and Amazon CloudFront
- AWS WAF Classic has been deprecated, and the post describes how to use the latest version of AWS WAF (WAFv2) to prevent hotlinking.
- Hotlinking can lead to slow loading times, lost revenue, and potential legal issues for the original site.
- AWS WAF integrated with Amazon CloudFront can help protect web applications against common web exploits.
- The article explains using header inspection in AWS WAF to prevent hotlinking while using a CDN like CloudFront.
- Two approaches are detailed: one with a separate subdomain and the other with content under the same domain.
- The first approach involves validating the Referer header, while the second approach adds filtering by path.
- AWS WAF configurations include web access control lists, rules, match conditions, and filters.
- The prerequisites include setting up a CloudFront distribution before configuring an AWS WAF web ACL.
- Testing the rules involves using cURL commands to verify proper protection against hotlinking.
- Further enhancements like rate-limiting, bot mitigation, and DDoS protections can be implemented with AWS WAF.
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