# Cargo feature graph > Every cargo feature on the tako-rs umbrella crate — transports, runtimes, plugins, extractors, observability, and runtime selection. The umbrella crate `tako-rs` is the public entry point. Sub-crate features are reached through it — for example, `tako-rs/multipart` turns on `tako-rs-extractors/multipart` and `tako-rs-core/multipart` together. You should never need to depend on `tako-rs-core`, `tako-rs-extractors`, `tako-rs-server`, `tako-rs-server-pt`, `tako-rs-streams`, or `tako-rs-plugins` directly. To inspect the current shape locally: ```bash cargo metadata --format-version 1 --no-deps \ | jq '.packages[] | select(.name == "tako-rs") | .features' ``` ## Transports | Feature | Description | Gates | | ------------------- | ------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------------------------------- | | *(default)* | HTTP/1.1, raw TCP, Unix sockets, static files, core extractors and middleware. No optional flags are enabled. | always on | | `ws` | WebSocket upgrades over HTTP/1.1 on either runtime; GraphQL subscriptions also require `async-graphql` and run on Tokio. | `tako-rs-core/ws` | | `sse` | Server-Sent Events on either runtime. | `tako-rs-streams/sse` | | `file-stream` | `FileStream` responder and range helpers; static file serving is available without this flag. | `tako-rs-streams/file-stream`, `tako-rs-core/file-stream` | | `proxy-protocol` | Trusted PROXY v1/v2 listener on either runtime. | `tako-rs-server/proxy-protocol` | | `udp` | Raw UDP datagrams on either runtime. | `tako-rs-server/udp` | | `socket-activation` | Inherit listener descriptors through `ListenFds`. | `tako-rs-server/socket-activation` | | `tls` | Server-side HTTPS via `rustls`. | `tako-rs-server/tls`, `tako-rs-core/tls` | | `http2` | HTTP/2 cleartext (h2c) and ALPN-negotiated h2 over TLS. | `tako-rs-server/http2`, `tako-rs-core/http2` | | `http3` | HTTP/3 over QUIC; also enables the QUIC dependency tree in `tako-rs-streams`. | `tako-rs-server/http3`, `tako-rs-streams/http3`, `tako-rs-core/http3` | | `webtransport` | W3C WebTransport sessions on the HTTP/3 server, on either runtime, plus the Tokio-only raw QUIC helper. Implies `http3`. | `http3`, `tako-rs-server/webtransport`, `tako-rs-streams/webtransport`, `tako-rs-core/webtransport` | | `vsock` | Linux vsock listener for sidecar workloads. | `tako-rs-server/vsock` | ## Runtime selection | Feature | Description | Gates | | ------------------- | ---------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------- | | `compio` | Switch the server to the `compio` runtime (io\_uring / IOCP / kqueue). Mutually exclusive with the tokio path at build time. | `tako-rs-core/compio`, `tako-rs-server/compio`, `tako-rs-streams/compio`, `tako-rs-plugins/compio`, `tako-rs-server-pt?/compio` | | `compio-tls` | TLS on compio. Implies `compio`. | `compio`, `tako-rs-server/compio-tls`, `tako-rs-core/compio-tls` | | `per-thread` | Thread-per-core HTTP/1; Tokio by default, Compio when `compio` is selected. | `dep:tako-rs-server-pt` | | `per-thread-compio` | Thread-per-core on Compio. Implies `per-thread` and `compio` throughout the workspace. | `per-thread`, `compio`, `tako-rs-server-pt/compio` | See [Runtime compatibility](/docs/concepts/runtimes) for the tokio vs compio trade-offs. ## Plugins, middleware, signals | Feature | Description | Gates | | ---------------- | ------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------- | | `plugins` | Bundled middleware and plugins (CORS, compression, rate limiting, idempotency). | `tako-rs-core/plugins`, `tako-rs-plugins/plugins`, `tako-rs-server/plugins`, `tako-rs-server-pt?/plugins` | | `signals` | In-process pub/sub bus, queue lifecycle signals, transport signals. | `tako-rs-core/signals`, `tako-rs-server/signals`, `tako-rs-plugins/signals`, `tako-rs-server-pt?/signals` | | `ip-filter` | `IpFilter` middleware. | `tako-rs-plugins/ip-filter` | | `hmac-signature` | `HmacSignature` middleware. | `tako-rs-plugins/hmac-signature` | | `json-schema` | `JsonSchema` request-validation middleware. | `tako-rs-plugins/json-schema` | | `zstd` | Zstandard compression in `plugins::compression`. Implies `plugins`. | `tako-rs-plugins/zstd`, `tako-rs-core/zstd`, `plugins` | ## Extractors | Feature | Description | Gates | | ---------------------- | --------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------ | | `multipart` | `Multipart` / `TakoTypedMultipart` body extractors. | `tako-rs-extractors/multipart`, `tako-rs-core/multipart` | | `protobuf` | `Protobuf` extractor via `prost`. | `tako-rs-extractors/protobuf`, `tako-rs-core/protobuf` | | `simd` | Umbrella that enables both `simd-sonic` and `simd-json-impl`. | `simd-sonic`, `simd-json-impl` | | `simd-sonic` | `sonic-rs`-backed JSON path. | `tako-rs-extractors/simd-sonic`, `tako-rs-core/simd-sonic` | | `simd-json-impl` | `simd-json`-backed JSON path. | `tako-rs-extractors/simd-json-impl`, `tako-rs-core/simd-json-impl` | | `typed-header` | `TypedHeader` extractor (via `headers`). | `tako-rs-extractors/typed-header` | | `zero-copy-extractors` | Borrowed variants of `Json`, `Form`, `Query`, `HeaderMap`. | `tako-rs-extractors/zero-copy-extractors`, `tako-rs-core/zero-copy-extractors` | | `validator` | `Validated` adapter for the [`validator`](https://crates.io/crates/validator) crate. | `tako-rs-extractors/validator` | | `garde` | `Validated` adapter for the [`garde`](https://crates.io/crates/garde) crate. | `tako-rs-extractors/garde` | | `jwt-simple` | JWT decode / verify backed by [`jwt-simple`](https://crates.io/crates/jwt-simple). | `tako-rs-plugins/jwt-simple`, `tako-rs-core/jwt-simple` | | `ahash` | Swap the default request hasher for `ahash` across the workspace. | `tako-rs-core/ahash`, `tako-rs-extractors/ahash`, `tako-rs-plugins/ahash` | ## Docs, GraphQL, gRPC, OpenAPI | Feature | Description | Gates | | --------------- | ---------------------------------------------------------------------- | ------------------------------------ | | `async-graphql` | GraphQL HTTP handlers; WebSocket subscriptions additionally need `ws`. | `tako-rs-core/async-graphql` | | `graphiql` | GraphiQL IDE endpoint. | `tako-rs-core/graphiql` | | `grpc` | gRPC unary and streaming RPCs via prost. | `tako-rs-core/grpc` | | `utoipa` | OpenAPI docs via [`utoipa`](https://crates.io/crates/utoipa). | `tako-rs-core/utoipa` | | `utoipa-yaml` | YAML output for the `utoipa` integration. Implies `utoipa`. | `utoipa`, `tako-rs-core/utoipa-yaml` | | `vespera` | OpenAPI docs via [`vespera`](https://crates.io/crates/vespera). | `tako-rs-core/vespera` | ## Observability backends | Feature | Description | Gates | | ----------------------- | ------------------------------------------------------------------------ | --------------------------------------------------------------------------------------------------- | | `tako-tracing` | `tracing-subscriber` integration helpers. | `tako-rs-core/tako-tracing`, `tako-rs-server/tako-tracing` | | `metrics-prometheus` | Prometheus scrape endpoint + histogram. Implies `plugins` and `signals`. | `tako-rs-plugins/metrics-prometheus`, `tako-rs-core/metrics-prometheus`, `plugins`, `signals` | | `metrics-opentelemetry` | OpenTelemetry OTLP metrics export. Implies `plugins` and `signals`. | `tako-rs-plugins/metrics-opentelemetry`, `tako-rs-core/metrics-opentelemetry`, `plugins`, `signals` | ## Queue `queue-cron` enables cron schedules and their chrono-based time calculations in `tako-rs-core`. ## Allocator | Feature | Description | Gates | | ---------- | --------------------------------------------------------------------------------- | ----------------------- | | `jemalloc` | Re-export `tikv-jemallocator`; the application installs its own global allocator. | `dep:tikv-jemallocator` | ## Runtime and protocol combinations `--all-features` compiles and selects Compio for the HTTP server, middleware, signals, queues, and per-thread workers. The Tokio-only raw QUIC helper is absent in that build. h2c is available through `http2`, WebTransport through `webtransport`, HTTP/3 through `http3`, PROXY protocol through `proxy-protocol`, Unix sockets on every unix target, and TLS with ALPN HTTP/2 through `compio-tls` plus `http2`. Tako enables Hyper's HTTP/2 support only through `http2` (other dependencies may also enable it). The workspace selects the Tokio runtime, I/O, timer, signal, filesystem, and synchronization features it uses instead of `full`. The workspace MSRV is Rust 1.95. See the [2.1 migration guide](/docs/reference/migration-2-1) for feature changes and explicit allocator configuration. ## Removed features `client` and `native-certs` were removed in 2.3.0, together with `tako::client`. Use [reqwest](https://crates.io/crates/reqwest) or [ureq](https://crates.io/crates/ureq) for outbound HTTP. Source: https://tako.rust-dd.com/docs/reference/features