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JA4: Rust client derives q/t marker from TLS extension 57 instead of transport context

Status: Open.

#307 In FoxIO-LLC/ja4;

· elpy1 opened on Jul 8, 2026

JA4H: Rust includes HTTP/2 pseudo-headers in header count and hash

Status: Open.

#306 In FoxIO-LLC/ja4;

· elpy1 opened on Jul 8, 2026

JA4: GREASE values and signature_algorithms

Status: Open.

#305 In FoxIO-LLC/ja4;

· elpy1 opened on Jul 7, 2026

JA4T: no text specification, and Rust diverges from Wireshark/Zeek

Status: Open.

#304 In FoxIO-LLC/ja4;

· elpy1 opened on Jul 7, 2026

Proposal: new JA4+ method for an "ephemeral-extension-invariant" stable client fingerprint (tentative name JA4E)

Status: Open.

#303 In FoxIO-LLC/ja4;

· giuseongit opened on Jun 30, 2026

[feature request] Add support for Caddy

Status: Open.

#289 In FoxIO-LLC/ja4;

· punkpeye opened on Mar 24, 2026

Database download contains invalid entries

Status: Open.

#286 In FoxIO-LLC/ja4;

· firthmj opened on Feb 24, 2026

no JA4 fields in zeek logs

zeekZeek packageZeek package

Status: Open.

#272 In FoxIO-LLC/ja4;

· thenesk opened on Nov 26, 2025

Empty ALPN handling bug in Zeek implementation

zeekZeek packageZeek package

Status: Open.

#233 In FoxIO-LLC/ja4;

· svenvanhal opened on Jun 20, 2025

[Discussion-Improvement] JA4H: take into the values of the headers too?

Status: Open.

#206 In FoxIO-LLC/ja4;

· unixfox opened on Feb 17, 2025

The JA4 fingerprint displayed on the official website is inconsistent with the JA4 fingerprint parsed by the Python script.

bugSomething isn't workingSomething isn't working

Status: Open.

#186 In FoxIO-LLC/ja4;

· ycq0125 opened on Nov 10, 2024

Handling of non-ascii charactors in ALPN

rustRust implementationRust implementation

Status: Open.

#178 In FoxIO-LLC/ja4;

· StarlightIbuki opened on Oct 28, 2024