const QUIC_INITIAL_MTU: u16 = 1200;Expand description
QUIC’s guaranteed-deliverable UDP payload size, in bytes, and the floor
that quinn::TransportConfig::initial_mtu and min_mtu silently raise
any smaller value to.
Defined here rather than imported because quinn keeps its INITIAL_MTU
private. The number is fixed by QUIC itself — the handshake establishes
that the path carries an unfragmented 1200-byte datagram body, so nothing
below it is a meaningful path MTU and quinn refuses to hold one.