without-http

A sans-IO-backed ASGI server and HTTP client for without. Where without-asgi is the app side of the ASGI boundary (it turns a server's receive/send into typed streams), without-http is the server side: it owns the socket and the HTTP wire protocol, and drives any ASGI app via app(scope, receive, send).

The wire-protocol state machines are themselves sans-IO libraries: h11 for HTTP/1.1, h2 for HTTP/2, and wsproto for WebSockets. without-http reads and writes socket bytes with asyncio, feeds them through those state machines, and uses without-asgi's server-direction codecs to translate between typed events and the ASGI dicts an app expects.

from without_async import sleep_forever
from without_asgi import make_asgi_app
from without_http import ConnectionPool, request, serving

app = make_asgi_app(lifespan, http=router.dispatch, websocket=sockets.dispatch)

async with serving(app, host="127.0.0.1", port=8000):
    await sleep_forever()  # run until cancelled

async with ConnectionPool() as pool:
    async with request(pool, "GET", "http://127.0.0.1:8000/items") as (head, body):
        assert head.status == 200
        data = await body.read()

Because without-http speaks plain ASGI to the app, any ASGI app runs over it, interchangeably with uvicorn. The server handles TLS, HTTP/2 (by ALPN or prior knowledge), keep-alive, WebSockets over the HTTP/1.1 upgrade, per-handler isolation, and flow control. A client is a function from a request to a response, and a ConnectionPool is the one that answers over the network: a (head, body) response split, buffered and streaming bodies in both directions, opt-in trailers, HTTP/2 multiplexing, per-host connection bounds, per-phase request timeouts, consumer-driven duplex (with bidirectional streaming over HTTP/2), and stack-composed middleware.

without_http.testing carries the same interface into a test: a mock client that answers from a function, an ASGI client that drives an app in memory, and a loopback client that runs the real wire protocols over no socket at all, plus the raw in-memory endpoints those are built from, for a test that writes frames rather than requests.

See the without-http guide (with the API reference) for the full surface, and Alternatives for where the client and server stand against httpx, aiohttp, niquests, and the ASGI servers, including which absences are gaps and which are positions.