Can not use `send_denial_response` with `StreamingResponse`

[Kludex]

Discussed in https://github.com/Kludex/starlette/discussions/2566

^{Originally posted by WSH032 April 6, 2024}

Describe the bug

If we use FileResponse or StreamingResponse when sending the Websocket Denial Response, a RuntimeError will occur.

To Reproduce

from fastapi import FastAPI, WebSocket
from fastapi.responses import StreamingResponse
from uvicorn import run

app = FastAPI()


@app.websocket("/")
async def _(ws: WebSocket):
    async def foo():
        yield "hello"
        yield "world"

    resp = StreamingResponse(content=foo())
    await ws.send_denial_response(resp)


run(app)

Steps to reproduce the behavior:

1. Launch the server
2. Try to establish the websocket connection
3. You will see following error

  |   File "e:\GitHub\fastapi-proxy\Untitled-8.py", line 16, in _
  |     await ws.send_denial_response(resp)
  |   File "E:\GitHub\fastapi-proxy\.venv\lib\site-packages\starlette\websockets.py", line 209, in send_denial_response        
  |     await response(self.scope, self.receive, self.send)
  |   File "E:\GitHub\fastapi-proxy\.venv\lib\site-packages\starlette\responses.py", line 258, in __call__
  |     async with anyio.create_task_group() as task_group:
  |   File "E:\GitHub\fastapi-proxy\.venv\lib\site-packages\anyio\_backends\_asyncio.py", line 678, in __aexit__
  |     raise BaseExceptionGroup(
  | exceptiongroup.ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
  +-+---------------- 1 ----------------
    | Traceback (most recent call last):
    |   File "E:\GitHub\fastapi-proxy\.venv\lib\site-packages\starlette\responses.py", line 261, in wrap
    |     await func()
    |   File "E:\GitHub\fastapi-proxy\.venv\lib\site-packages\starlette\responses.py", line 243, in stream_response
    |     await send(
    |   File "E:\GitHub\fastapi-proxy\.venv\lib\site-packages\starlette\websockets.py", line 75, in send
    |     raise RuntimeError(
    | RuntimeError: Expected ASGI message "websocket.accept","websocket.close" or "websocket.http.response.start",but got 'http.response.start'
    +------------------------------------

Expected behavior

FileResponse and StreamingResponse override the __call__ method, but they do not add the "websocket." prefix like the parent class Response does.

https://github.com/encode/starlette/blob/4e453ce91940cc7c995e6c728e3fdf341c039056/starlette/responses.py#L151-L154

If this is expected behavior, I didn't see any relevant information in the documentation, and at least the type checker didn't raise any errors

Configuration

starlette == 0.37.2