Missing 'scheme' key in ws scope

#### Environment
python: 3.11.5
aiofiles==23.2.1
blinker==1.8.2
click==8.1.7
Flask==3.0.3
h11==0.14.0
h2==4.1.0
hpack==4.0.0
Hypercorn==0.17.3
hyperframe==6.0.1
itsdangerous==2.2.0
Jinja2==3.1.4
MarkupSafe==2.1.5
pathvalidate==3.2.1
priority==2.0.0
PyJWT==2.9.0
pyzmq==26.0.3
Quart==0.19.6
Quart-JWT-Extended==0.1.0
six==1.16.0
Werkzeug==3.0.3
wsproto==1.2.0

OS: OpenSUSE Tumbleweed
Browser: Firefox 132.0.1

#### CMD
daphne run_service:quart_app -e ssl:44444:privateKey=../dev/ssl/key.pem:certKey=../dev/ssl/cert.pem

#### Issue
While running a [Quart](https://github.com/pallets/quart/tree/main) app i get the following stacktrace on a websocket request:
```
2024-11-06 17:01:34,181 | ERROR: Exception inside application: 'scheme' (server.py:297)
Traceback (most recent call last):
File "/LOCAL/garcia/Projects/triplaystudio/.venv/lib/python3.11/site-packages/quart/app.py", line 1667, in __call__
await self.asgi_app(scope, receive, send)
File "/LOCAL/garcia/Projects/triplaystudio/.venv/lib/python3.11/site-packages/quart/app.py", line 1693, in asgi_app
await asgi_handler(receive, send)
File "/LOCAL/garcia/Projects/triplaystudio/.venv/lib/python3.11/site-packages/quart/asgi.py", line 166, in __call__
websocket = self._create_websocket_from_scope(send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/LOCAL/garcia/Projects/triplaystudio/.venv/lib/python3.11/site-packages/quart/asgi.py", line 204, in _create_websocket_from_scope
self.scope["scheme"],
~~~~~~~~~~^^^^^^^^^^
KeyError: 'scheme'
10.242.2.5:57258 - - [06/Nov/2024:17:01:34] "WSDISCONNECT /conn" - -
```
It seems like the 'scheme' property is missing for the websocket connection scope. I am not 100% sure if this issue belongs to daphne, since the [asgi documentation](https://asgi.readthedocs.io/en/latest/specs/www.html#websocket) marks 'scheme' as an optional setting. However, the documentation also states 'but must not be empty'. If this is indeed related to the Quart project i am really sorry for posting it here. I tested the same code with [Hypercorn](https://github.com/pgjones/hypercorn), so the actual request itself should not be an issue here.