Tests freezing due to TypeError in uvicorn

[carlsmedstad]

Hey, Arch Linux maintainer here 👋

The test suite freezes when ran in our package build process:

$ test-env/bin/python -m pytest -v
========================================= test session starts =========================================
platform linux -- Python 3.13.2, pytest-8.3.5, pluggy-1.5.0 -- /home/carsme/repos/gitlab.archlinux.org/archlinux/packaging/packages/python-socketio/src/python-socketio-5.12.1/test-env/bin/python
cachedir: .pytest_cache
rootdir: /home/carsme/repos/gitlab.archlinux.org/archlinux/packaging/packages/python-socketio/src/python-socketio-5.12.1
configfile: pyproject.toml
plugins: asyncio-0.25.1
asyncio: mode=Mode.AUTO, asyncio_default_fixture_loop_scope=session
collected 598 items

tests/async/test_admin.py::TestAsyncAdmin::test_missing_auth PASSED                             [  0%]
tests/async/test_admin.py::TestAsyncAdmin::test_admin_connect_with_no_auth

Enabling output in pytest with -s, shows an infinite stream of the these errors:

INFO:     127.0.0.1:48446 - "GET / HTTP/1.1" 200 OK
ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/usr/lib/python3.13/site-packages/uvicorn/protocols/http/httptools_impl.py", line 409, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        self.scope, self.receive, self.send
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/lib/python3.13/site-packages/uvicorn/middleware/proxy_headers.py", line 60, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/engineio/async_drivers/asgi.py", line 75, in __call__
    await self.other_asgi_app(scope, receive, send)
  File "/home/carsme/repos/gitlab.archlinux.org/archlinux/packaging/packages/python-socketio/src/python-socketio-5.12.1/tests/asyncio_web_server.py", line 21, in http_app
    await send({'type': 'http.response.start',
                'status': 200,
                'headers': [('Content-Type', 'text/plain')]})
  File "/usr/lib/python3.13/site-packages/uvicorn/protocols/http/httptools_impl.py", line 489, in send
    if HEADER_RE.search(name):
       ~~~~~~~~~~~~~~~~^^^^^^
TypeError: cannot use a bytes pattern on a string-like object

Applying the following patch fixes the issue:

diff --unified --recursive --text --new-file python-socketio-5.12.1.orig/tests/asyncio_web_server.py python-socketio-5.12.1/tests/asyncio_web_server.py
--- python-socketio-5.12.1.orig/tests/asyncio_web_server.py	2025-03-26 08:24:31.233690502 +0100
+++ python-socketio-5.12.1/tests/asyncio_web_server.py	2025-03-26 08:24:46.039851489 +0100
@@ -20,7 +20,7 @@
         async def http_app(scope, receive, send):
             await send({'type': 'http.response.start',
                         'status': 200,
-                        'headers': [('Content-Type', 'text/plain')]})
+                        'headers': [(b'Content-Type', b'text/plain')]})
             await send({'type': 'http.response.body',
                         'body': b'OK'})

Not sure if the issue is in this socketio (5.12.1) or in uvicorn (0.34.0).

Input appreciated!

[miguelgrinberg]

This issue is probably mine, but I don't understand why this does not happen in my own test runs. Thanks, I'll investigate.