[Rust] Add tokio - HTTP/1.1

frameworks/tokio/.dockerignore

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+target
+.git

frameworks/tokio/.gitignore

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+/target

frameworks/tokio/Cargo.toml

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+[package]
+name = "httparena-tokio"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+socket2 = { version = "0.5", features = ["all"] }
+tokio = { version = "1", default-features = false, features = ["io-util", "net", "rt"] }
+
+[profile.release]
+codegen-units = 1
+lto = "thin"
+opt-level = 3
+panic = "abort"

frameworks/tokio/Dockerfile

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+FROM rust:1.95 AS build
+WORKDIR /app
+COPY Cargo.toml Cargo.lock ./
+RUN mkdir src && echo "fn main() {}" > src/main.rs \
+    && cargo build --release \
+    && rm -rf src target/release/httparena-tokio target/release/deps/httparena_tokio*
+COPY src ./src
+RUN RUSTFLAGS="-C target-cpu=native" cargo build --release
+
+FROM debian:bookworm-slim
+COPY --from=build /app/target/release/httparena-tokio /server
+EXPOSE 8080
+CMD ["/server"]

frameworks/tokio/README.md

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+# tokio
+
+A minimal **HTTP/1.1** server on raw **tokio** — no HTTP framework. It serves the
+H1-isolated profiles (`baseline`, `pipelined`, `limited-conn`) with a hand-rolled
+request parser on a tokio `TcpStream`.
+
+## Serving model
+One `current_thread` tokio runtime per core, each binding `:8080` with
+`SO_REUSEPORT` (kernel-sharded accept, no cross-core work-stealing), `TCP_NODELAY`
+per connection. Responses are batched per read, so a pipelined burst flushes in
+one write.
+
+## Hand-rolled HTTP/1.1
+Request line + headers, `Content-Length` **and** `Transfer-Encoding: chunked`
+bodies, keep-alive (multiple requests per connection), request pipelining, and
+fragmented-read reassembly (requests split across `recv`s).
+
+| Endpoint | Response |
+|---|---|
+| `GET/POST /baseline11?a=&b=` | `text/plain` — `a + b` (+ POST body as an integer) |
+| `GET /pipeline` | `text/plain` — `ok` |
+
+`PORT` overrides the listen port for local testing (defaults to 8080).

frameworks/tokio/meta.json

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+{
+  "display_name": "tokio",
+  "language": "Rust",
+  "type": "engine",
+  "engine": "tokio",
+  "description": "Minimal HTTP/1.1 server on raw tokio — no HTTP framework. A hand-rolled request parser (request line, headers, Content-Length + chunked bodies, keep-alive, pipelining, fragmented reads) on a tokio TcpStream, with one current-thread runtime per core and SO_REUSEPORT.",
+  "repo": "https://github.com/tokio-rs/tokio",
+  "enabled": true,
+  "tests": [
+    "baseline",
+    "pipelined",
+    "limited-conn"
+  ],
+  "maintainers": []
+}