Routes cannot use the exact parameters

[yi250]

When I checked the official demo recently, I found that this code can't start the route and the parameter is missing

import uvicorn
from starlette.applications import Starlette
from starlette.requests import Request
from starlette.responses import Response, PlainTextResponse
from starlette.routing import Route

async def apps(scope, receive, send):
    assert scope['type'] == 'http'
    request = Request(scope, receive)
    content = '%s %s' % (request.method, request.url.path)
    response = Response(content, media_type='text/plain')
    await response(scope, receive, send)


def text(request):
    return PlainTextResponse('Hello')

routes = [
    Route("/s/{s}", endpoint=apps),
    Route("/t/{t}", endpoint=text),
]

app = Starlette(routes=routes)
if __name__ == "__main__":
    uvicorn.run(app, host="127.0.0.1", port=8082)  

error code

ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "C:\Users\Yi\PycharmProjects\AppText\venv\lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 366, in run_asgi
    result = await app(self.scope, self.receive, self.send)
  File "C:\Users\Yi\PycharmProjects\AppText\venv\lib\site-packages\uvicorn\middleware\proxy_headers.py", line 75, in __call__
    return await self.app(scope, receive, send)
  File "C:\Users\Yi\PycharmProjects\AppText\venv\lib\site-packages\starlette\applications.py", line 124, in __call__
    await self.middleware_stack(scope, receive, send)
  File "C:\Users\Yi\PycharmProjects\AppText\venv\lib\site-packages\starlette\middleware\errors.py", line 184, in __call__
    raise exc
  File "C:\Users\Yi\PycharmProjects\AppText\venv\lib\site-packages\starlette\middleware\errors.py", line 162, in __call__
    await self.app(scope, receive, _send)
  File "C:\Users\Yi\PycharmProjects\AppText\venv\lib\site-packages\starlette\exceptions.py", line 93, in __call__
    raise exc
  File "C:\Users\Yi\PycharmProjects\AppText\venv\lib\site-packages\starlette\exceptions.py", line 82, in __call__
    await self.app(scope, receive, sender)
  File "C:\Users\Yi\PycharmProjects\AppText\venv\lib\site-packages\starlette\routing.py", line 670, in __call__
    await route.handle(scope, receive, send)
  File "C:\Users\Yi\PycharmProjects\AppText\venv\lib\site-packages\starlette\routing.py", line 266, in handle
    await self.app(scope, receive, send)
  File "C:\Users\Yi\PycharmProjects\AppText\venv\lib\site-packages\starlette\routing.py", line 65, in app
    response = await func(request)
TypeError: apps() missing 2 required positional arguments: 'receive' and 'send'

The routing service doesn't seem to inherit receive and send, and can't go down

[jhominal]

Route.endpoint currently accepts either:

• a function or method that takes a starlette.requests.Request and returns a starlette.responses.Response object (like your text),
• or a class that has an __init__ that implements the ASGI interface (which you can use by e.g. subclassing starlette.endpoints.HTTPEndpoint).

As apps is not in either case, it doesn’t work with Route.endpoint as currently implemented by Starlette.

There is more information in the documentation, in the Routing section.