It’s not currently possible. Some of us run with patches exposing the TLS extensions to support this use case. The relevant GitHub issue is https://github.com/golang/go/issues/32936

-eli 

On Mar 6, 2023, at 2:14 PM, Aurora <aurora136...@gmail.com> wrote:

Is it possible to capture the whole TLS handshake data coming from a HTTP client request, enough to actually build a JA3 hash out of it?

The tls.ClientHelloInfo does apparently give some but not all the parts which are needed to build a JA3 hash.

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