RuntimeError with Uvicorn (invalid Content-Length)

[medihack]

When using django-revproxy with Uvicorn I get the below RuntimeError when trying to access a view inheriting from ProxyView. This is not the case when using Daphne as a server. Uvicorn seems to be very strict with Content-Length. Is there a workaround?

ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/opt/pysetup/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py", line 399, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/pysetup/.venv/lib/python3.12/site-packages/uvicorn/middleware/proxy_headers.py", line 70, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/pysetup/.venv/lib/python3.12/site-packages/channels/routing.py", line 62, in __call__
    return await application(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/pysetup/.venv/lib/python3.12/site-packages/django/core/handlers/asgi.py", line 170, in __call__
    await self.handle(scope, receive, send)
  File "/opt/pysetup/.venv/lib/python3.12/site-packages/django/core/handlers/asgi.py", line 216, in handle
    task.result()
  File "/opt/pysetup/.venv/lib/python3.12/site-packages/django/core/handlers/asgi.py", line 195, in process_request
    await self.send_response(response, send)
  File "/opt/pysetup/.venv/lib/python3.12/site-packages/django/core/handlers/asgi.py", line 357, in send_response
    await send(
  File "/opt/pysetup/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py", line 526, in send
    raise RuntimeError("Response content longer than Content-Length")
RuntimeError: Response content longer than Content-Length

[medihack]

It seems this is not a problem with Uvicorn. It looks more like Daphne is not so strict (for better or worse). So the question is more why the Content-Length is wrong in the first place. Must it be set at all by the ProxyView?

[andruten]

Hi @medihack!

Thanks for posting the issue. There is an open issue, #122, asking for asgi support. I would like to dedicate some time to implement async await in django-revproxy... I'll try to find a spot in the near future...