Sometimes it returns 500

[albertoleoncio]

Traceback (most recent call last):
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py", line 419, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/uvicorn/middleware/proxy_headers.py", line 84, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/fastapi/applications.py", line 1054, in __call__
    await super().__call__(scope, receive, send)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/applications.py", line 123, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/middleware/errors.py", line 186, in __call__
    raise exc
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/middleware/errors.py", line 164, in __call__
    await self.app(scope, receive, _send)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/middleware/base.py", line 189, in __call__
    with collapse_excgroups():
  File "/layers/heroku_python/python/lib/python3.12/contextlib.py", line 158, in __exit__
    self.gen.throw(value)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/_utils.py", line 91, in collapse_excgroups
    raise exc
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/middleware/base.py", line 191, in __call__
    response = await self.dispatch_func(request, call_next)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspace/app.py", line 63, in session_middleware
    response = await call_next(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/middleware/base.py", line 165, in call_next
    raise app_exc
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/middleware/base.py", line 151, in coro
    await self.app(scope, receive_or_disconnect, send_no_error)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/middleware/cors.py", line 91, in __call__
    await self.simple_response(scope, receive, send, request_headers=headers)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/middleware/cors.py", line 146, in simple_response
    await self.app(scope, receive, send)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/middleware/sessions.py", line 83, in __call__
    await self.app(scope, receive, send_wrapper)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/middleware/exceptions.py", line 62, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/_exception_handler.py", line 64, in wrapped_app
    raise exc
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    await app(scope, receive, sender)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/routing.py", line 762, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/routing.py", line 782, in app
    await route.handle(scope, receive, send)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/routing.py", line 297, in handle
    await self.app(scope, receive, send)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/routing.py", line 77, in app
    await wrap_app_handling_exceptions(app, request)(scope, receive, send)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/_exception_handler.py", line 64, in wrapped_app
    raise exc
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    await app(scope, receive, sender)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/starlette/routing.py", line 72, in app
    response = await func(request)
               ^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/fastapi/routing.py", line 299, in app
    raise e
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/fastapi/routing.py", line 294, in app
    raw_response = await run_endpoint_function(
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/fastapi/routing.py", line 191, in run_endpoint_function
    return await dependant.call(**values)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspace/routes/linkchecker.py", line 102, in check_links
    results = await asyncio.gather(*tasks)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspace/routes/linkchecker.py", line 36, in make_request
    response = await client.head(url[1])
               ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpx/_client.py", line 1844, in head
    return await self.request(
           ^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpx/_client.py", line 1559, in request
    return await self.send(request, auth=auth, follow_redirects=follow_redirects)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpx/_client.py", line 1646, in send
    response = await self._send_handling_auth(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpx/_client.py", line 1674, in _send_handling_auth
    response = await self._send_handling_redirects(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpx/_client.py", line 1711, in _send_handling_redirects
    response = await self._send_single_request(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpx/_client.py", line 1748, in _send_single_request
    response = await transport.handle_async_request(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpx/_transports/default.py", line 371, in handle_async_request
    resp = await self._pool.handle_async_request(req)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpcore/_async/connection_pool.py", line 268, in handle_async_request
    raise exc
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpcore/_async/connection_pool.py", line 251, in handle_async_request
    response = await connection.handle_async_request(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpcore/_async/connection.py", line 99, in handle_async_request
    raise exc
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpcore/_async/connection.py", line 76, in handle_async_request
    stream = await self._connect(request)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpcore/_async/connection.py", line 156, in _connect
    stream = await stream.start_tls(**kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpcore/_backends/anyio.py", line 78, in start_tls
    raise exc
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/httpcore/_backends/anyio.py", line 69, in start_tls
    ssl_stream = await anyio.streams.tls.TLSStream.wrap(
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/anyio/streams/tls.py", line 132, in wrap
    await wrapper._call_sslobject_method(ssl_object.do_handshake)
  File "/layers/heroku_python/dependencies/lib/python3.12/site-packages/anyio/streams/tls.py", line 172, in _call_sslobject_method
    raise EndOfStream from None
anyio.EndOfStream

[albertoleoncio]

I couldn't find a way to solve this problem. It occurs when the server of one of the links unexpectedly closes the connection, and the anyio library doesn't understand how to proceed and raises an exception (even making the tool forget that CORS exists and generating errors in the client log).

This response seems to be close to the problem, but I couldn't implement it.

[albertoleoncio]

Problematic link: https://musicbrainz.org/area/ded88b07-192f-4265-95a6-5085ee12f4ca