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aiohttp.client_exceptions.ContentTypeError: 200, message='Attempt to decode JSON with unexpected mimetype: text/plain; charset=utf-8', url='http://localhost:11434/api/chat' #101
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Originally created by @RainerEmrich on GitHub (Sep 26, 2025).
Using an ollama cloud model I get an exception:
2025-09-26 12:18:46.362 | ERROR | open_webui.routers.tasks:generate_follow_ups:308 - Exception occurred
Traceback (most recent call last):
File "F:\Programme\open-webui\backend\open_webui\routers\ollama.py", line 192, in send_post_request
res = await r.json()
│ └ <function ClientResponse.json at 0x0000018DB9CFECA0>
└ <ClientResponse(http://localhost:11434/api/chat) [200 OK]>
<CIMultiDictProxy('Date': 'Fri, 26 Sep 2025 10:18:46 GMT', 'Conten...
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\site-packages\aiohttp\client_reqrep.py", line 749, in json
raise ContentTypeError(
└ <class 'aiohttp.client_exceptions.ContentTypeError'>
aiohttp.client_exceptions.ContentTypeError: 200, message='Attempt to decode JSON with unexpected mimetype: text/plain; charset=utf-8', url='http://localhost:11434/api/chat'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "", line 198, in _run_module_as_main
File "", line 88, in _run_code
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Scripts\uvicorn.exe__main__.py", line 7, in
sys.exit(main())
│ │ └
│ └
└ <module 'sys' (built-in)>
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\site-packages\click\core.py", line 1442, in call
return self.main(args, **kwargs)
│ │ │ └ {}
│ │ └ ()
│ └ <function Command.main at 0x0000018DB7DF3C40>
└
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\site-packages\click\core.py", line 1363, in main
rv = self.invoke(ctx)
│ │ └ <click.core.Context object at 0x0000018DB8026F10>
│ └ <function Command.invoke at 0x0000018DB7DF3920>
└
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\site-packages\click\core.py", line 1226, in invoke
return ctx.invoke(self.callback, **ctx.params)
│ │ │ │ │ └ {'host': '0.0.0.0', 'port': 8080, 'forwarded_allow_ips': "''", 'workers': 1, 'ws': 'auto', 'app': 'open_webui.main:app', 'ud...
│ │ │ │ └ <click.core.Context object at 0x0000018DB8026F10>
│ │ │ └ <function main at 0x0000018DB80174C0>
│ │ └
│ └ <function Context.invoke at 0x0000018DB7DF2B60>
└ <click.core.Context object at 0x0000018DB8026F10>
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\site-packages\click\core.py", line 794, in invoke
return callback(args, **kwargs)
│ │ └ {'host': '0.0.0.0', 'port': 8080, 'forwarded_allow_ips': "''", 'workers': 1, 'ws': 'auto', 'app': 'open_webui.main:app', 'ud...
│ └ ()
└ <function main at 0x0000018DB80174C0>
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\site-packages\uvicorn\main.py", line 413, in main
run(
└ <function run at 0x0000018DB7E55300>
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\site-packages\uvicorn\main.py", line 580, in run
server.run()
│ └ <function Server.run at 0x0000018DB7EA1580>
└ <uvicorn.server.Server object at 0x0000018DB7E2E350>
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\site-packages\uvicorn\server.py", line 67, in run
return asyncio.run(self.serve(sockets=sockets))
│ │ │ │ └ None
│ │ │ └ <function Server.serve at 0x0000018DB7EA1620>
│ │ └ <uvicorn.server.Server object at 0x0000018DB7E2E350>
│ └ <function run at 0x0000018DB76D4220>
└ <module 'asyncio' from 'D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\asyncio\__init__.py'>
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\asyncio\runners.py", line 190, in run
return runner.run(main)
│ │ └ <coroutine object Server.serve at 0x0000018DB7FF0130>
│ └ <function Runner.run at 0x0000018DB7744400>
└ <asyncio.runners.Runner object at 0x0000018DB802AA10>
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\asyncio\runners.py", line 118, in run
return self._loop.run_until_complete(task)
│ │ │ └ <Task pending name='Task-1' coro=<Server.serve() running at D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\site-p...
│ │ └ <function BaseEventLoop.run_until_complete at 0x0000018DB773DEE0>
│ └
└ <asyncio.runners.Runner object at 0x0000018DB802AA10>
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\asyncio\base_events.py", line 641, in run_until_complete
self.run_forever()
│ └ <function ProactorEventLoop.run_forever at 0x0000018DB77FDF80>
└
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\asyncio\windows_events.py", line 321, in run_forever
super().run_forever()
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\asyncio\base_events.py", line 608, in run_forever
self._run_once()
│ └ <function BaseEventLoop._run_once at 0x0000018DB773FC40>
└
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\asyncio\base_events.py", line 1936, in _run_once
handle._run()
│ └ <function Handle._run at 0x0000018DB76891C0>
└ <Handle Task.task_wakeup( result=None>)>
File "D:\Users\rainer\AppData\Local\anaconda3\envs\openwebui\Lib\asyncio\events.py", line 84, in _run
self._context.run(self._callback, *self._args)
│ │ │ │ │ └ <member '_args' of 'Handle' objects>
│ │ │ │ └ <Handle Task.task_wakeup( result=None>)>
│ │ │ └ <member '_callback' of 'Handle' objects>
│ │ └ <Handle Task.task_wakeup( result=None>)>
│ └ <member '_context' of 'Handle' objects>
└ <Handle Task.task_wakeup( result=None>)>
File "F:\Programme\open-webui\backend\open_webui\main.py", line 1514, in process_chat
return await process_chat_response(
└ <function process_chat_response at 0x0000018DFC181760>
File "F:\Programme\open-webui\backend\open_webui\utils\middleware.py", line 2956, in process_chat_response
return await response_handler(response, events)
│ │ └ []
│ └ <starlette.responses.StreamingResponse object at 0x0000018E01869550>
└ <function process_chat_response..response_handler at 0x0000018E01A10680>
File "F:\Programme\open-webui\backend\open_webui\utils\middleware.py", line 2938, in response_handler
await background_tasks_handler()
└ <function process_chat_response..background_tasks_handler at 0x0000018E01A13F60>
File "F:\Programme\open-webui\backend\open_webui\utils\middleware.py", line 1280, in background_tasks_handler
res = await generate_follow_ups(
└ <function generate_follow_ups at 0x0000018DFAA16480>
File "F:\Programme\open-webui\backend\open_webui\utils\chat.py", line 262, in generate_chat_completion
response = await generate_ollama_chat_completion(
└ <function generate_chat_completion at 0x0000018DF99DFD80>
File "F:\Programme\open-webui\backend\open_webui\routers\ollama.py", line 1371, in generate_chat_completion
return await send_post_request(
└ <function send_post_request at 0x0000018DF99AE840>
File "F:\Programme\open-webui\backend\open_webui\routers\ollama.py", line 200, in send_post_request
raise HTTPException(
└ <class 'fastapi.exceptions.HTTPException'>
fastapi.exceptions.HTTPException: 200: Ollama: 200, message='Attempt to decode JSON with unexpected mimetype: text/plain; charset=utf-8', url='http://localhost:11434/api/chat'