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fingerproxy's Issues

Clarifying the Scrapfly JA3

I came across your project and saw "JA3 and HTTP2 fingerprint; JA3 result is probably incorrect". I'm part of Scrapfly, so let me clarify:

https://scrapfly.io/web-scraping-tools/ja3-fingerprint
JA3 and HTTP2 fingerprint; JA3 result probably needs to be corrected (it doesn't match Wireshark's result).

We made the decision not to read the deprecated TLS version from the handshake on version >= TLS1.3 but read the "supported_versions." The original ja3 implementation is now old, and it makes no sense for us to get a fingerprint that does not reflect the version. In TLS1.3, you get 771 on the original ja3 (771 is the TLS1.2 version); our version gives the correct version, 772. https://datatracker.ietf.org/doc/html/rfc8446#section-1.3.

You can see both fields on https://scrapfly.io/web-scraping-tools/ja3-fingerprint page, "Handshake Version" vs. "Supported Versions"

So yes, our Ja3 is not comparable with others, as we are not interested in getting fingerprints that do not reflect the actual client, TLS1.2 and TLS1.3 having the same config can't collide.

Feel free to close ;)

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