Parsing issue of the CONNECT method

[TUO-Wu]

Version
bfa754e

Platform
Ubuntu 11.4.0-1ubuntu1~22.04

Description
Hello, I may have found a bug in uvicorn's parsing of CONNECT requests.
RFC 9112 says this:

A server MUST reject a CONNECT request that targets an empty or invalid port number, typically by responding with a 400 (Bad Request) status code.

However, uvicorn does not reject such CONNECT request, and does not establish a proxy connection. It responses with 200 OK.
For example:

CONNECT victim.com HTTP/1.1\r\n
Host: victim.com\r\n
\r\n

$ echo -ne "CONNECT victim.com HTTP/1.1\r\nHost: victim.com\r\n\r\n" | nc 172.18.0.3 80
HTTP/1.1 200 OK
date: Thu, 20 Mar 2025 09:24:30 GMT
server: uvicorn
content-type: application/json

Here are some logs:

 INFO:     172.18.0.1:59674 - "CONNECT victim.com HTTP/1.1" 200 OK
 ERROR:    Exception in ASGI application
 Traceback (most recent call last):
   File "/usr/local/lib/python3.10/dist-packages/uvicorn/protocols/http/h11_impl.py", line 403, in run_asgi
     result = await app(  # type: ignore[func-returns-value]
   File "/usr/local/lib/python3.10/dist-packages/uvicorn/middleware/proxy_headers.py", line 60, in __call__
     return await self.app(scope, receive, send)
   File "/app/server.py", line 48, in app
     await send(
   File "/usr/local/lib/python3.10/dist-packages/uvicorn/protocols/http/h11_impl.py", line 500, in send
     output = self.conn.send(event=h11.Data(data=data))
   File "/usr/local/lib/python3.10/dist-packages/h11/_connection.py", line 512, in send
     data_list = self.send_with_data_passthrough(event)
   File "/usr/local/lib/python3.10/dist-packages/h11/_connection.py", line 537, in send_with_data_passthrough
     self._process_event(self.our_role, event)
   File "/usr/local/lib/python3.10/dist-packages/h11/_connection.py", line 272, in _process_event
     self._cstate.process_event(role, type(event), server_switch_event)
   File "/usr/local/lib/python3.10/dist-packages/h11/_state.py", line 293, in process_event
     self._fire_event_triggered_transitions(role, _event_type)
   File "/usr/local/lib/python3.10/dist-packages/h11/_state.py", line 311, in _fire_event_triggered_transitions
     raise LocalProtocolError(
 h11._util.LocalProtocolError: can't handle event type Data when role=SERVER and state=SWITCHED_PROTOCOL