Module http 

Minimal HTTP/1.1 server with fixed connection slots.

Reference infrastructure for the web contributor. Serves the embedded single-file UI (web/dist), the config REST surface (GET/POST /api/config) and hands /ws upgrades to super::ws.

Design: SLOTS long-lived tasks, each owning one [TcpSocket] for its entire life (accept → handle → close → accept). No socket is ever created or dropped after boot — TcpSocket::new allocates a slot from the shared pool and re-creating sockets per connection proved fatal on hardware (unlogged reboot). smoltcp accepts one pending connection per listening socket, so SLOTS tasks accept SLOTS connections in parallel; SYNs beyond that are RST and the browser retries.

Macros

slot_task 🔒

Enums

Outcome 🔒

What happened to a connection after the request was read.

ReadError 🔒

Why a request could not be read — drives the error response.

Constants

HTTP_PORT

TCP listen port.

REQUEST_TIMEOUT 🔒

Budget for reading and serving one plain request.

RX_SIZE 🔒

Per-slot receive buffer (headers plus a config-sized body).

SLOTS 🔒

Parallel connection slots. The UI is a single inlined HTML file, so a page load plus font, config fetch and WebSocket stays well below this.

TX_SIZE 🔒

Per-slot transmit buffer.

Statics

FREDOKA_TTF 🔒

UI font (web/src/style.scss loads /fonts/Fredoka.ttf).

INDEX_HTML 🔒

Built UI (run inv web:build first — include_bytes! tracks the file).

Functions

content_length 🔒

Parsed Content-Length (0 when absent).

find_headers_end 🔒

Offset of the \r\n\r\n terminator, if present.

get_config 🔒

GET /api/config → full config as JSON.

parse_body 🔒

Body slice following the header terminator (clamped to announced length).

parse_request_line 🔒

Method and path of the request line. A block without \r\n (header-less minimal request) is treated as the line itself.

post_config 🔒

POST /api/config → merge patch, persist, apply; returns the status.

read_request 🔒

Read until \r\n\r\n plus the announced body; returns total length.

recycle 🔒

Close gracefully, then wait for Closed so listen() is legal again.

route 🔒

Read one request and either answer it or flag the upgrade.

send_response 🔒

Status + headers + body; bodies larger than the TX buffer are streamed.

send_status 🔒

Status-only response (e.g. 404).

serve 🔒

Connection-slot loop: accept → route (or WS session) → recycle, forever.

slot0

HTTP connection slot 0: accept → route → recycle, permanently.

slot1

HTTP connection slot 1: accept → route → recycle, permanently.

slot2

HTTP connection slot 2: accept → route → recycle, permanently.

slot3

HTTP connection slot 3: accept → route → recycle, permanently.

spawn_all

Spawn all HTTP slots against the given stack.

starts_with_ci 🔒

Case-insensitive prefix test.

trim 🔒

Trim ASCII whitespace/CR.

ws_key 🔒

Extract Sec-WebSocket-Key from the header block.