//! WebSocket support (RFC 6455).
//!
//! v0.4 chunk 1: the upgrade handshake. A handler that wants to speak
//! WebSocket calls [`Conn::upgrade`](crate::Conn::upgrade); on a valid
//! handshake the connection actor writes the `101 Switching Protocols`
//! response and leaves the HTTP request loop. (Until the duplex wiring
//! lands — chunk 3 — leaving the loop closes the socket; the 101 itself
//! is correct and tested.)
//!
//! Dependency note: SHA-1 comes from `sha1_smol` (zero transitive deps),
//! spending urus dependency slot #3 — agreed in the v0.4 design pass over
//! vendoring. Base64 here is the 20-byte *encode* direction only and is
//! not cryptographic, so that stays in-tree (`handshake::b64`).

pub mod handshake;

pub use handshake::Rejection;

/// Marker carried on a [`Conn`](crate::Conn) whose handler accepted a
/// WebSocket upgrade. Opaque: chunk 3 grows this into the handler/duplex
/// handoff payload, so nothing outside the crate should depend on its
/// shape.
#[derive(Debug)]
pub struct WsUpgrade {
    pub(crate) _priv: (),
}