Cheatsheet

Basic App

from quart import Quart

app = Quart(__name__)

@app.route("/hello")
async def hello():
    return "Hello, World!"

if __name__ == "__main__":
    app.run(debug=True)

Routing

@app.route("/hello/<string:name>")  # example.com/hello/quart
async def hello(name):
    return f"Hello, {name}!"

Request Methods

@app.route("/get")  # GET Only by default
@app.route("/get", methods=["GET", "POST"])  # GET and POST
@app.route("/get", methods=["DELETE"])  # Just DELETE

JSON Responses

@app.route("/hello")
async def hello():
    return {"Hello": "World!"}

Template Rendering

from quart import render_template

@app.route("/hello")
async def hello():
    return await render_template("index.html")  # Required to be in templates/

Configuration

import json
import tomllib

app.config["VALUE"] = "something"

app.config.from_file("filename.toml", tomllib.load)
app.config.from_file("filename.json", json.load)

Request

from quart import request

@app.route("/hello")
async def hello():
    request.method
    request.url
    request.headers["X-Bob"]
    request.args.get("a")  # Query string e.g. example.com/hello?a=2
    await request.get_data()  # Full raw body
    (await request.form)["name"]
    (await request.get_json())["key"]
    request.cookies.get("name")

WebSocket

from quart import websocket

@app.websocket("/ws")
async def ws():
    websocket.headers
    while True:
        try:
            data = await websocket.receive()
            await websocket.send(f"Echo {data}")
        except asyncio.CancelledError:
            # Handle disconnect
            raise

Cookies

from quart import make_response

@app.route("/hello")
async def hello():
    response = await make_response("Hello")
    response.set_cookie("name", "value")
    return response

Abort

from quart import abort

@app.route("/hello")
async def hello():
    abort(409)

HTTP/2 & HTTP/3 Server Push

from quart import make_push_promise, url_for

@app.route("/hello")
async def hello():
    await make_push_promise(url_for('static', filename='css/minimal.css'))
    ...