Implementing a JA4H-Equivalent Fingerprint with Amazon CloudFront Functions to Mitigate Bot Traffic
JA3 and JA4 fingerprints have been showing up more and more often in discussions about bot mitigation and client identification. Amazon CloudFront exposes TLS-based JA4 as a CloudFront-generated header, but it does not provide the HTTP-request-based JA4H fingerprint. That made me wonder: “Why not implement it ourselves with CloudFront Functions?” So I did. There are a few gotchas and design considerations you need to be aware of, and I’ll cover those as well. In this article, I’ll first demonstr
