Manage OpenAI API Connections - New connection .NET REST API stall when saving

[mccdan]

Hello, can't figure out the following problem: My setup is Open WebUI running locally under Docker. I deployed locally a .NET 9 REST API that follows OpenAI API. I've implemented the following operations:

CORS are enabled also. Here is the response Body when operation [GET] Models is called:
{
"$id": "1",
"object": "list",
"data": {
"$id": "2",
"$values": [
{
"$id": "3",
"id": "codex-chat-model-v1",
"object": "model",
"created": 1742063247,
"ownedBy": "codex"
},
{
"$id": "4",
"id": "codex-embedding-model-v1",
"object": "model",
"created": 1742063247,
"ownedBy": "codex"
}
]
}
}

Now, in Open WebUI, under user/Admin Panel/Settings/Connections/Manage OpenAI API Connections -> I've added a new connection to my AP, the url is: http://host.docker.internal:5189
When I click the Verify Connection icon, I get the "Server connection verified". I can debug into my API and see the call from Open WebUI. However, when I click save, I have the saving cursor running eternally. If I stop the container and I try to restart and access the Open WebUI via the browser, I get a blank page and I have to remove the container and start again. If I check the docker log for oqen-webui container, I can see this:
await self.app(scope, receive_or_disconnect, send_no_error)
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/base.py", line 177, in call
with recv_stream, send_stream, collapse_excgroups():
File "/usr/local/lib/python3.11/contextlib.py", line 158, in exit
self.gen.throw(typ, value, traceback)
File "/usr/local/lib/python3.11/site-packages/starlette/_utils.py", line 82, in collapse_excgroups
raise exc
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/base.py", line 179, in call
response = await self.dispatch_func(request, call_next)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/backend/open_webui/main.py", line 889, in commit_session_after_request
response = await call_next(request)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/base.py", line 154, in call_next
raise app_exc
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/base.py", line 141, in coro
await self.app(scope, receive_or_disconnect, send_no_error)
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/base.py", line 177, in call
with recv_stream, send_stream, collapse_excgroups():
File "/usr/local/lib/python3.11/contextlib.py", line 158, in exit
self.gen.throw(typ, value, traceback)
File "/usr/local/lib/python3.11/site-packages/starlette/_utils.py", line 82, in collapse_excgroups
raise exc
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/base.py", line 179, in call
response = await self.dispatch_func(request, call_next)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/backend/open_webui/utils/security_headers.py", line 11, in dispatch
response = await call_next(request)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/base.py", line 154, in call_next
raise app_exc
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/base.py", line 141, in coro
await self.app(scope, receive_or_disconnect, send_no_error)
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/base.py", line 177, in call
with recv_stream, send_stream, collapse_excgroups():
File "/usr/local/lib/python3.11/contextlib.py", line 158, in exit
self.gen.throw(typ, value, traceback)
File "/usr/local/lib/python3.11/site-packages/starlette/_utils.py", line 82, in collapse_excgroups
raise exc
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/base.py", line 179, in call
response = await self.dispatch_func(request, call_next)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/backend/open_webui/main.py", line 878, in dispatch
response = await call_next(request)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/base.py", line 154, in call_next
raise app_exc
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/base.py", line 141, in coro
await self.app(scope, receive_or_disconnect, send_no_error)
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/exceptions.py", line 62, in call
await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
File "/usr/local/lib/python3.11/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
raise exc
File "/usr/local/lib/python3.11/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
await app(scope, receive, sender)
File "/usr/local/lib/python3.11/site-packages/starlette/routing.py", line 715, in call
await self.middleware_stack(scope, receive, send)
File "/usr/local/lib/python3.11/site-packages/starlette/routing.py", line 735, in app
await route.handle(scope, receive, send)
File "/usr/local/lib/python3.11/site-packages/starlette/routing.py", line 288, in handle
await self.app(scope, receive, send)
File "/usr/local/lib/python3.11/site-packages/starlette/routing.py", line 76, in app
await wrap_app_handling_exceptions(app, request)(scope, receive, send)
File "/usr/local/lib/python3.11/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
raise exc
File "/usr/local/lib/python3.11/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
await app(scope, receive, sender)
File "/usr/local/lib/python3.11/site-packages/starlette/routing.py", line 73, in app
response = await f(request)
^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/fastapi/routing.py", line 301, in app
raw_response = await run_endpoint_function(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/fastapi/routing.py", line 212, in run_endpoint_function
return await dependant.call(**values)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/backend/open_webui/main.py", line 1020, in get_models
all_models = await get_all_models(request, user=user)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/backend/open_webui/utils/models.py", line 64, in get_all_models
models = await get_all_base_models(request, user=user)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/backend/open_webui/utils/models.py", line 39, in get_all_base_models
openai_models = await openai.get_all_models(request, user=user)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/aiocache/decorators.py", line 109, in wrapper
return await self.decorator(f, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/aiocache/decorators.py", line 124, in decorator
result = await f(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/backend/open_webui/routers/openai.py", line 441, in get_all_models
models = {"data": merge_models_lists(map(extract_data, responses))}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/backend/open_webui/routers/openai.py", line 411, in merge_models_lists
[
File "/app/backend/open_webui/routers/openai.py", line 420, in
if (model.get("id") or model.get("name"))
^^^^^^^^^
AttributeError: 'str' object has no attribute 'get'

Here is response body when Open WebUI verify it:
{
"$id": "1",
"object": "list",
"data": {
"$id": "2",
"$values": [
{
"$id": "3",
"id": "codex-chat-model-v1",
"object": "model",
"created": 1742064408,
"ownedBy": "codex"
},
{
"$id": "4",
"id": "codex-embedding-model-v1",
"object": "model",
"created": 1742064408,
"ownedBy": "codex"
}
]
}
}

So the question is: What is the problem here!?!
Thanks!