//! HTTP/1.1 message syntax ([RFC 9112]).
//!
//! I/O-free coroutines implementing the HTTP/1.1 wire protocol: no sockets, no
//! async runtime, no `std`. Shared types (status codes, headers, request,
//! response) live in [`crate::rfc9110`].
//!
//! [RFC 9112]: https://www.rfc-editor.org/rfc/rfc9112