Features

Core

Feature	Description	Dependencies
`binary`	Binary protocol (POST `/_api`, WS framing, TCP framing)	—
`http`	HTTP server	hyper, hyper-util, http-body-util
`ws`	WebSocket server	tokio-tungstenite, futures-util, `binary`
`tcp`	TCP server (length-prefix framing)	`binary`

Code Generation

Feature	Description	Dependencies
`ts`	TypeScript client generation (ESM + full types)	—
`js`	JavaScript client generation (ESM + JSDoc)	—
`kt`	Kotlin client generation	—
`rs`	Rust client generation (Tokio async / std sync TCP)	—
`cs`	C# / .NET client generation (HttpClient / WebSocket / TCP)	—
`code`	On-demand code generation at `/code/{service}/{lang}`	`http`

Documentation

Feature	Description	Dependencies
`doc`	Interactive API docs at `/doc` endpoint	`http`, `js`

Ordinary Routes

Feature	Description	Dependencies
`ordinary-http`	RESTful JSON endpoints (`#[get]`/`#[post]`/etc.)	`http`, serde, serde_json
`ordinary-ws`	Path-based WebSocket endpoints (`#[ws]`)	`ws`, `ordinary-http`
`ordinary-sse`	Server-Sent Events endpoints (`#[sse]`)	`ordinary-http`, futures-util

Protocol Options

Feature	Description
`seq64`	WS request ID uses `i64` (default `i32`)
`len64`	WS payload length uses `u64` (default `u32`)
`tag-u8`	Enum tag uses `u8` (default)
`tag-u16`	Enum tag uses `u16`
`tag-u32`	Enum tag uses `u32`

TLS

Feature	Description	Dependencies
`tls`	HTTPS via rustls with ALPN for HTTP/2, hot-reload via channel	`http`, tokio-rustls, rustls, rustls-pemfile

Optional Capabilities

Feature	Description
`marker`	Marker-based conditional serialization via `AFast::marker()`
`hook`	Lifecycle hooks (`before_request`/`on_connect`/etc.), global and per-service
`rate-limit`	Named-policy rate limiting (FixedWindow/SlidingWindow/TokenBucket)
`tls`	TLS/HTTPS support via rustls with ALPN

Note: If the server uses seq64 or len64, generated client code must use the same feature, otherwise protocol mismatch will occur.

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