13 - Quart

Quart is an ASGI re-implementation of the Flask API with some added ASGI specific features, such as websockets. If you have a Flask project and would like to go truly async, migrating to Quart is an option. Quart recently became a Pallets project (the folks behind Flask, Click, Jinja, etc) and they apparently intend to merge Quart and Flask to eventually have ASGI support in Flask.

Read more

• Docs: https://quart.palletsprojects.com/en/latest/index.html
• GitHub repo: https://github.com/pallets/quart
• Quart became part of Pallets: https://palletsprojects.com/blog/quart-pallets/

The code

from typing import Any

from quart import Quart, request

app = Quart(__name__)


@app.post("/my-endpoint")
async def my_endpoint() -> dict[str, Any]:
    request_json = await request.get_json()
    return {"echoed data": request_json}


#######################################
# Let's test it
import pytest


@pytest.mark.asyncio
async def test_my_endpoint() -> None:
    client = app.test_client()

    response = await client.post("/my-endpoint", json={"foo": "bar"})

    assert response.status_code == 200
    response_data = await response.get_json()
    assert response_data == {"echoed data": {"foo": "bar"}}

tested with:

quart==0.17.0

pytest==7.1.1
pytest-asyncio==0.18.3

Run the server:

QUART_APP=quart_example:app quart run

Or just the test case:

pytest quart_example.py