CLI Native HTTP/3 (QUIC) Support - Atrahasis Changelog

HTTP/3 isn't a future feature in atra cli, it's compiled in. No custom builds, no feature flags, no separate binary.

Automatic negotiation

By default atra cli picks the best protocol the server supports. For a modern API, that usually means HTTP/2 over TLS; if the server advertises HTTP/3 via Alt-Svc, atra upgrades the connection on subsequent requests.

Connection pooling happens automatically across redirects and flow steps, so a multi-step flow against the same origin reuses the same connection where possible — fewer handshakes, lower latency.

Force any protocol

Sometimes you want to know exactly what's on the wire. Pin the version explicitly:

# Force HTTP/3 (QUIC)
atra https://api.example.com --http3

# Force HTTP/2
atra https://api.example.com --http2

# Force HTTP/1.1
atra https://api.example.com --http1.1

The protocol used appears in the status line on every response, so you always know what you got — for example: 200 OK · HTTP/2 · 203 ms · 243 B.