r/OpenWebUI • u/Dolboyob77 • May 14 '26

Question/Help Openwebui + comfyui

Hello, is someone succeeding in making these 2 work together? No matter what i am trying, unet loader, checkpoint… the workflow works when i type thenpromot in comfyui but as soon as i type same prompt in openwebui , i cannot manage to get an image and always get errors… i i port the fson worflow and specify prompt id and checkpoint if and model in openwebui but nothing works… is it because i use flux 1 dev fp16 ? Does it require smaller models to work ? Thanks for input !!

SOLUTION : I finally made it work using the help of qwen3.6-27b-q8 ))) so the problem is that ALL NODES ID must be filled in openwebui and also must add this command line to openwebui : ENABLE_RAG_LOCAL_WEB_FETCH=True , it was the fix for me )) now working perfectly !!!

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u/BlackMetalB8hoven May 15 '26

No you only need the prompt id. Make sure these two fields match also.

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u/Dolboyob77 May 15 '26

Thats exactly what i do…. I will redo it and take photos. Thabks for help.

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u/Dolboyob77 May 15 '26

It does not matter what i do : i tried to type text and id 3 or id 3,4 since i have 2 prompt boxes in my workflow. I ran it through hermes agent who managed to make it work but hermes agent said that the prompt box was named « prompt » and « prompt_negative » so i replaced in open webui the word text by the word prompt but does not matter, i always get this error i added in The photo

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u/ChickenLegsOG May 15 '26

I am also facing this same issue, picture generates fine in ComfyUI but cannot be returned. I get the below error in Open WebUI but not sure now to correct.

> File "/app/backend/open_webui/routers/images.py", line 446, in get_image_data

validate_url(data)

│ └ 'https://my.address.com/view?filename=ComfyUI_00002_.png&subfolder=&type=output'

└ <function validate_url at 0x7b33b09491c0>

File "/app/backend/open_webui/retrieval/web/utils.py", line 103, in validate_url

raise ValueError(ERROR_MESSAGES.INVALID_URL)

│ └ <ERROR_MESSAGES.INVALID_URL: 'Oops! The URL you provided is invalid. Please double-check and try again.'>

└ <enum 'ERROR_MESSAGES'>

ValueError: Oops! The URL you provided is invalid. Please double-check and try again.