client: add optional quic.version (v1 or v2) - #1673
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Lets the client pick the QUIC version to dial: v1 or v2. Unset keeps the current behavior (v1). v2 turns off the Chrome parrot since Chrome doesn't do v2.
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This adds a client-only
quic.versionoption to allow dialing QUIC v2.Other clients like sing-box, Xray, and TUIC only support v1 right now, but the Hysteria server already accepts v2. Adding this gives us a good foundation for supporting v2 going forward. (Some firewalls around the world only block v1...)
The option only changes the QUIC handshake itself. Lower-level transport features like obfs and port hopping run beneath QUIC, so they work with v2 without any issues. No server-side code was touched.
I tested this locally, including with obfs and port hopping enabled under v2, and everything works as expected. I am happy to update the docs on hysteria.network if this gets merged.