High-performance HTTP server primitives for the zincio runtime.

zincio-http provides HTTP/1.0, HTTP/1.1, HTTP/2, and HTTP/3 connection handlers behind a shared HttpProtocol trait. Each handler receives an http::Request<Incoming> and returns an http::Response<B>, where B: http_body::Body<Data = bytes::Bytes>.

• HTTP/1.x, HTTP/2, and HTTP/3 handlers with a common interface
• Streaming request/response bodies and trailers
• Automatic 100 Continue support
• 103 Early Hints support via send_early_hints
• HTTP/1 upgrade support (prepare_upgrade / OnUpgrade)
• Linux and FreeBSD zero-copy response sending for HTTP/1.x (h1-zerocopy feature)
• Graceful shutdown support for all protocol handlers via CancellationToken
• Custom HTTP/2 and HTTP/3 implementations, without dependencies on Hyperium's h2 and h3 crates

[dependencies]
zincio-http = "0.4"

By default, this crate enables: h1, h1-zerocopy, and h2.

For a smaller build, disable default features and opt in explicitly:

[dependencies]
zincio-http = { version = "0.4", default-features = false, features = ["h1"] }

use bytes::Bytes;
use http::Response;
use http_body_util::Full;
use zincio::net::TcpListener;
use zincio::RuntimeBuilder;
use zincio_http::{Http1, Http1Options, HttpProtocol};

fn main() -> std::io::Result<()> {
    let runtime = RuntimeBuilder::new().enable_timer(true).build()?;

    runtime.block_on(async {
        let listener = TcpListener::bind("127.0.0.1:8080")?;
        loop {
            let (stream, _) = listener.accept().await?;
            stream.set_nodelay(true)?;
            let stream = stream.into_poll()?;

            zincio::spawn(async move {
                if let Err(e) = Http1::new(stream, Http1Options::default())
                    .handle(|_request| async move {
                        Ok::<_, std::convert::Infallible>(Response::new(Full::new(
                            Bytes::from_static(b"Hello World"),
                        )))
                    })
                    .await
                {
                    eprintln!("HTTP error: {:?}", e);
                }
            });
        }
    })
}

Use send_early_hints from your handler before returning the final response.

Notes:

• HTTP/2 and HTTP/3: available by default
• HTTP/1.x: requires Http1Options::enable_early_hints(true)

use http::{header, HeaderMap, Response};
use http_body_util::Empty;
use zincio_http::send_early_hints;

let handler = |mut req| async move {
    let mut hints = HeaderMap::new();
    hints.insert(
        header::LINK,
        "</app.css>; rel=preload; as=style".parse().unwrap(),
    );
    let _ = send_early_hints(&mut req, hints).await;

    Ok::<_, std::convert::Infallible>(Response::new(Empty::<bytes::Bytes>::new()))
};

Http1Options, Http2Options, and Http3Options all expose:

• handshake / accept timeouts
• automatic 100 Continue
• HTTP protocol-specific configuration

For upgrade workflows (for example WebSocket-style handoff), call prepare_upgrade(&mut request) in your handler and await the returned OnUpgrade future after sending a 101 Switching Protocols response.

The resolved Upgraded type implements tokio::io::AsyncRead + AsyncWrite.

When built with h1-zerocopy on Linux or FreeBSD:

1. Convert your handler with .zerocopy()
2. Mark responses with unsafe install_zerocopy(response, raw_fd)

Responses carrying that extension are sent via kernel-assisted transfer. Other responses fall back to normal HTTP/1 writes.

Http1, Http2, and Http3 expose:

.graceful_shutdown_token(token)

Cancel the token to stop accepting new work and shut down the connection cleanly.

The crate ships Criterion benchmarks for the HPACK/QPACK codecs:

# HPACK encode + decode
cargo bench --features h2 --bench h2_hpack

# HPACK encode with large headers
cargo bench --features h2 --bench h2_hpack_large

# QPACK round-trip (table sizes 0/512/4096, Huffman on/off)
cargo bench --features h3 --bench h3_qpack

# QPACK encode with large headers
cargo bench --features h3 --bench h3_qpack_large

• HttpProtocol: common protocol trait (handle, handle_with_error_fn)
• Incoming: type-erased request body type used in all handlers
• send_early_hints: send a 103 Early Hints interim response
• Http1 / Http1Options
• Http2 / Http2Options
• Http3 / Http3Options
• zincio_http::quinn::Connection: QUIC transport adapter (with h3-quinn)
• prepare_upgrade, OnUpgrade, Upgraded (HTTP/1 upgrade flow)

MIT