I have searched for any existing and/or related issues.
I have searched for any existing and/or related discussions.
I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!).
I am using the latest version of Open WebUI.
Installation Method
Docker
Open WebUI Version
v0.7.2
Ollama Version (if applicable)
No response
Operating System
Ubuntu 22.04
Browser (if applicable)
Firefox 147.0.3
Confirmation
I have read and followed all instructions in README.md.
I am using the latest version of both Open WebUI and Ollama.
I have included the browser console logs.
I have included the Docker container logs.
I have provided every relevant configuration, setting, and environment variable used in my setup.
I have clearly listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
I have documented step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation. My steps:
Start with the initial platform/version/OS and dependencies used,
Specify exact install/launch/configure commands,
List URLs visited, user input (incl. example values/emails/passwords if needed),
Describe all options and toggles enabled or changed,
Include any files or environmental changes,
Identify the expected and actual result at each stage,
Ensure any reasonably skilled user can follow and hit the same issue.
Expected Behavior
I used a routing transformation technique to convert the image generation model from a third-party vendor into an interface that conforms to the OpenAI API definition and provides it to Open-WebUI. Theoretically, this should work correctly and provide image generation capabilities.
Actual Behavior
However, Open-WebUI used the 'Content-Type': 'application/json' request header for the returned image URL, causing the model provider to refuse to respond.
Steps to Reproduce
use https://github.com/QuantumNous/new-api project to convert model wan2.6-t2i from Aliyun Bailian to a custom API which compliant with OpenAPI routing specifications
try to use this api
The system displayed the message: "An error occurred while generating an image".
Logs & Screenshots
Backend Log:
2026-02-11 09:09:27.216 | INFO | uvicorn.protocols.http.httptools_impl:send:483 - 112.49.200.164:0 - "POST /api/chat/completions HTTP/1.1" 200
2026-02-11 09:09:27.269 | INFO | uvicorn.protocols.http.httptools_impl:send:483 - 112.49.200.164:0 - "GET /api/v1/chats/?page=1 HTTP/1.1" 200
2026-02-11 09:09:41.422 | ERROR | open_webui.routers.images:get_image_data:499 - Error loading image data: 403 Client Error: Forbidden for url: https://dashscope-result-sh.oss-cn-shanghai.aliyuncs.com/1d/8d/20260211/7147d395/6ff1f9f0-09b9-#######
Traceback (most recent call last):
File "<frozen runpy>", line 198, in _run_module_as_main
File "<frozen runpy>", line 88, in _run_code
File "/usr/local/lib/python3.11/site-packages/uvicorn/__main__.py", line 4, in <module>
uvicorn.main()
│ └ <Command main>
└ <module 'uvicorn' from '/usr/local/lib/python3.11/site-packages/uvicorn/__init__.py'>
File "/usr/local/lib/python3.11/site-packages/click/core.py", line 1485, in __call__
return self.main(*args, **kwargs)
│ │ │ └ {}
│ │ └ ()
│ └ <function Command.main at 0x7fe0de99ee80>
└ <Command main>
File "/usr/local/lib/python3.11/site-packages/click/core.py", line 1406, in main
rv = self.invoke(ctx)
│ │ └ <click.core.Context object at 0x7fe0df866850>
│ └ <function Command.invoke at 0x7fe0de99eb60>
└ <Command main>
File "/usr/local/lib/python3.11/site-packages/click/core.py", line 1269, in invoke
return ctx.invoke(self.callback, **ctx.params)
│ │ │ │ │ └ {'host': '0.0.0.0', 'port': 8080, 'forwarded_allow_ips': '*', 'workers': 1, 'app': 'open_webui.main:app', 'uds': None, 'fd': ...
│ │ │ │ └ <click.core.Context object at 0x7fe0df866850>
│ │ │ └ <function main at 0x7fe0de658b80>
│ │ └ <Command main>
│ └ <function Context.invoke at 0x7fe0de99dda0>
└ <click.core.Context object at 0x7fe0df866850>
File "/usr/local/lib/python3.11/site-packages/click/core.py", line 824, in invoke
return callback(*args, **kwargs)
│ │ └ {'host': '0.0.0.0', 'port': 8080, 'forwarded_allow_ips': '*', 'workers': 1, 'app': 'open_webui.main:app', 'uds': None, 'fd': ...
│ └ ()
└ <function main at 0x7fe0de658b80>
File "/usr/local/lib/python3.11/site-packages/uvicorn/main.py", line 424, in main
run(
└ <function run at 0x7fe0de8f94e0>
File "/usr/local/lib/python3.11/site-packages/uvicorn/main.py", line 594, in run
server.run()
│ └ <function Server.run at 0x7fe0de8f8d60>
└ <uvicorn.server.Server object at 0x7fe0dea7ad50>
File "/usr/local/lib/python3.11/site-packages/uvicorn/server.py", line 67, in run
return asyncio_run(self.serve(sockets=sockets), loop_factory=self.config.get_loop_factory())
│ │ │ │ │ │ └ <function Config.get_loop_factory at 0x7fe0dea814e0>
│ │ │ │ │ └ <uvicorn.config.Config object at 0x7fe0de666b50>
│ │ │ │ └ <uvicorn.server.Server object at 0x7fe0dea7ad50>
│ │ │ └ None
│ │ └ <function Server.serve at 0x7fe0de8f8e00>
│ └ <uvicorn.server.Server object at 0x7fe0dea7ad50>
└ <function asyncio_run at 0x7fe0de991e40>
File "/usr/local/lib/python3.11/site-packages/uvicorn/_compat.py", line 30, in asyncio_run
return runner.run(main)
│ │ └ <coroutine object Server.serve at 0x7fe0de6558a0>
│ └ <function Runner.run at 0x7fe0dec40fe0>
└ <asyncio.runners.Runner object at 0x7fe0de8aed90>
File "/usr/local/lib/python3.11/asyncio/runners.py", line 118, in run
return self._loop.run_until_complete(task)
│ │ │ └ <Task pending name='Task-1' coro=<Server.serve() running at /usr/local/lib/python3.11/site-packages/uvicorn/server.py:71> wai...
│ │ └ <cyfunction Loop.run_until_complete at 0x7fe0de6cc040>
│ └ <uvloop.Loop running=True closed=False debug=False>
└ <asyncio.runners.Runner object at 0x7fe0de8aed90>
File "/app/backend/open_webui/main.py", line 1710, in process_chat
form_data, metadata, events = await process_chat_payload(
│ │ └ <function process_chat_payload at 0x7fe061df7d80>
│ └ {'user_id': '290239f3-e91c-4e8e-9dbc-dd503bb9a0d8', 'chat_id': 'dd1c9f9c-abdb-4b4b-b772-615d6ec91f85', 'message_id': 'a9f8e32...
└ {'stream': True, 'model': 'qwen3-max-2026-01-23', 'messages': [{'role': 'user', 'content': '生成一个素描画，一只可爱的猫咪坐在窗台上，窗外是星空，数字艺术风格...
File "/app/backend/open_webui/utils/middleware.py", line 1588, in process_chat_payload
form_data = await chat_image_generation_handler(
└ <function chat_image_generation_handler at 0x7fe061df7b00>
File "/app/backend/open_webui/utils/middleware.py", line 1130, in chat_image_generation_handler
images = await image_generations(
└ <function image_generations at 0x7fe063f4e5c0>
File "/app/backend/open_webui/routers/images.py", line 639, in image_generations
image_data, content_type = get_image_data(image_url, headers)
│ │ └ {'Authorization': 'Bearer sk-gtL0gS#############ZwuDYhI3SwmrD', 'Content-Type': 'application/json'}
│ └ 'https://dashscope-result-sh.oss-cn-shanghai.aliyuncs.com/1d/8d/20260211/7147d395/6ff1f9f0-09b9-4dc7-8485-476514867d02.png?Ex...
└ <function get_image_data at 0x7fe063f4e020>
> File "/app/backend/open_webui/routers/images.py", line 482, in get_image_data
r.raise_for_status()
│ └ <function Response.raise_for_status at 0x7fe0dc32c5e0>
└ <Response [403]>
File "/usr/local/lib/python3.11/site-packages/requests/models.py", line 1026, in raise_for_status
raise HTTPError(http_error_msg, response=self)
│ │ └ <Response [403]>
│ └ '403 Client Error: Forbidden for url: https://dashscope-result-sh.oss-cn-shanghai.aliyuncs.com/1d/8d/20260211/7147d395/6ff1f9...
└ <class 'requests.exceptions.HTTPError'>
requests.exceptions.HTTPError: 403 Client Error: Forbidden for url: https://dashscope-result-sh.oss-cn-shanghai.aliyuncs.com/1d/8d/20260211/7147d395/6ff1f###14867d02.png?###
Originally created by @Randark-JMT on GitHub (Feb 11, 2026).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/21301
### Check Existing Issues
- [x] I have searched for any existing and/or related issues.
- [x] I have searched for any existing and/or related discussions.
- [x] I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!).
- [x] I am using the latest version of Open WebUI.
### Installation Method
Docker
### Open WebUI Version
v0.7.2
### Ollama Version (if applicable)
_No response_
### Operating System
Ubuntu 22.04
### Browser (if applicable)
Firefox 147.0.3
### Confirmation
- [x] I have read and followed all instructions in `README.md`.
- [x] I am using the latest version of **both** Open WebUI and Ollama.
- [x] I have included the browser console logs.
- [x] I have included the Docker container logs.
- [x] I have **provided every relevant configuration, setting, and environment variable used in my setup.**
- [x] I have clearly **listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup** (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
- [x] I have documented **step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation**. My steps:
- Start with the initial platform/version/OS and dependencies used,
- Specify exact install/launch/configure commands,
- List URLs visited, user input (incl. example values/emails/passwords if needed),
- Describe all options and toggles enabled or changed,
- Include any files or environmental changes,
- Identify the expected and actual result at each stage,
- Ensure any reasonably skilled user can follow and hit the same issue.
### Expected Behavior
I used a routing transformation technique to convert the image generation model from a third-party vendor into an interface that conforms to the OpenAI API definition and provides it to Open-WebUI. Theoretically, this should work correctly and provide image generation capabilities.
### Actual Behavior
However, Open-WebUI used the 'Content-Type': 'application/json' request header for the returned image URL, causing the model provider to refuse to respond.
### Steps to Reproduce
1. use https://github.com/QuantumNous/new-api project to convert model `wan2.6-t2i` from Aliyun Bailian to a custom API which compliant with OpenAPI routing specifications
2. try to use this api
3. The system displayed the message: "An error occurred while generating an image".
### Logs & Screenshots
Backend Log:
```log
2026-02-11 09:09:27.216 | INFO | uvicorn.protocols.http.httptools_impl:send:483 - 112.49.200.164:0 - "POST /api/chat/completions HTTP/1.1" 200
2026-02-11 09:09:27.269 | INFO | uvicorn.protocols.http.httptools_impl:send:483 - 112.49.200.164:0 - "GET /api/v1/chats/?page=1 HTTP/1.1" 200
2026-02-11 09:09:41.422 | ERROR | open_webui.routers.images:get_image_data:499 - Error loading image data: 403 Client Error: Forbidden for url: https://dashscope-result-sh.oss-cn-shanghai.aliyuncs.com/1d/8d/20260211/7147d395/6ff1f9f0-09b9-#######
Traceback (most recent call last):
File "<frozen runpy>", line 198, in _run_module_as_main
File "<frozen runpy>", line 88, in _run_code
File "/usr/local/lib/python3.11/site-packages/uvicorn/__main__.py", line 4, in <module>
uvicorn.main()
│ └ <Command main>
└ <module 'uvicorn' from '/usr/local/lib/python3.11/site-packages/uvicorn/__init__.py'>
File "/usr/local/lib/python3.11/site-packages/click/core.py", line 1485, in __call__
return self.main(*args, **kwargs)
│ │ │ └ {}
│ │ └ ()
│ └ <function Command.main at 0x7fe0de99ee80>
└ <Command main>
File "/usr/local/lib/python3.11/site-packages/click/core.py", line 1406, in main
rv = self.invoke(ctx)
│ │ └ <click.core.Context object at 0x7fe0df866850>
│ └ <function Command.invoke at 0x7fe0de99eb60>
└ <Command main>
File "/usr/local/lib/python3.11/site-packages/click/core.py", line 1269, in invoke
return ctx.invoke(self.callback, **ctx.params)
│ │ │ │ │ └ {'host': '0.0.0.0', 'port': 8080, 'forwarded_allow_ips': '*', 'workers': 1, 'app': 'open_webui.main:app', 'uds': None, 'fd': ...
│ │ │ │ └ <click.core.Context object at 0x7fe0df866850>
│ │ │ └ <function main at 0x7fe0de658b80>
│ │ └ <Command main>
│ └ <function Context.invoke at 0x7fe0de99dda0>
└ <click.core.Context object at 0x7fe0df866850>
File "/usr/local/lib/python3.11/site-packages/click/core.py", line 824, in invoke
return callback(*args, **kwargs)
│ │ └ {'host': '0.0.0.0', 'port': 8080, 'forwarded_allow_ips': '*', 'workers': 1, 'app': 'open_webui.main:app', 'uds': None, 'fd': ...
│ └ ()
└ <function main at 0x7fe0de658b80>
File "/usr/local/lib/python3.11/site-packages/uvicorn/main.py", line 424, in main
run(
└ <function run at 0x7fe0de8f94e0>
File "/usr/local/lib/python3.11/site-packages/uvicorn/main.py", line 594, in run
server.run()
│ └ <function Server.run at 0x7fe0de8f8d60>
└ <uvicorn.server.Server object at 0x7fe0dea7ad50>
File "/usr/local/lib/python3.11/site-packages/uvicorn/server.py", line 67, in run
return asyncio_run(self.serve(sockets=sockets), loop_factory=self.config.get_loop_factory())
│ │ │ │ │ │ └ <function Config.get_loop_factory at 0x7fe0dea814e0>
│ │ │ │ │ └ <uvicorn.config.Config object at 0x7fe0de666b50>
│ │ │ │ └ <uvicorn.server.Server object at 0x7fe0dea7ad50>
│ │ │ └ None
│ │ └ <function Server.serve at 0x7fe0de8f8e00>
│ └ <uvicorn.server.Server object at 0x7fe0dea7ad50>
└ <function asyncio_run at 0x7fe0de991e40>
File "/usr/local/lib/python3.11/site-packages/uvicorn/_compat.py", line 30, in asyncio_run
return runner.run(main)
│ │ └ <coroutine object Server.serve at 0x7fe0de6558a0>
│ └ <function Runner.run at 0x7fe0dec40fe0>
└ <asyncio.runners.Runner object at 0x7fe0de8aed90>
File "/usr/local/lib/python3.11/asyncio/runners.py", line 118, in run
return self._loop.run_until_complete(task)
│ │ │ └ <Task pending name='Task-1' coro=<Server.serve() running at /usr/local/lib/python3.11/site-packages/uvicorn/server.py:71> wai...
│ │ └ <cyfunction Loop.run_until_complete at 0x7fe0de6cc040>
│ └ <uvloop.Loop running=True closed=False debug=False>
└ <asyncio.runners.Runner object at 0x7fe0de8aed90>
File "/app/backend/open_webui/main.py", line 1710, in process_chat
form_data, metadata, events = await process_chat_payload(
│ │ └ <function process_chat_payload at 0x7fe061df7d80>
│ └ {'user_id': '290239f3-e91c-4e8e-9dbc-dd503bb9a0d8', 'chat_id': 'dd1c9f9c-abdb-4b4b-b772-615d6ec91f85', 'message_id': 'a9f8e32...
└ {'stream': True, 'model': 'qwen3-max-2026-01-23', 'messages': [{'role': 'user', 'content': '生成一个素描画，一只可爱的猫咪坐在窗台上，窗外是星空，数字艺术风格...
File "/app/backend/open_webui/utils/middleware.py", line 1588, in process_chat_payload
form_data = await chat_image_generation_handler(
└ <function chat_image_generation_handler at 0x7fe061df7b00>
File "/app/backend/open_webui/utils/middleware.py", line 1130, in chat_image_generation_handler
images = await image_generations(
└ <function image_generations at 0x7fe063f4e5c0>
File "/app/backend/open_webui/routers/images.py", line 639, in image_generations
image_data, content_type = get_image_data(image_url, headers)
│ │ └ {'Authorization': 'Bearer sk-gtL0gS#############ZwuDYhI3SwmrD', 'Content-Type': 'application/json'}
│ └ 'https://dashscope-result-sh.oss-cn-shanghai.aliyuncs.com/1d/8d/20260211/7147d395/6ff1f9f0-09b9-4dc7-8485-476514867d02.png?Ex...
└ <function get_image_data at 0x7fe063f4e020>
> File "/app/backend/open_webui/routers/images.py", line 482, in get_image_data
r.raise_for_status()
│ └ <function Response.raise_for_status at 0x7fe0dc32c5e0>
└ <Response [403]>
File "/usr/local/lib/python3.11/site-packages/requests/models.py", line 1026, in raise_for_status
raise HTTPError(http_error_msg, response=self)
│ │ └ <Response [403]>
│ └ '403 Client Error: Forbidden for url: https://dashscope-result-sh.oss-cn-shanghai.aliyuncs.com/1d/8d/20260211/7147d395/6ff1f9...
└ <class 'requests.exceptions.HTTPError'>
requests.exceptions.HTTPError: 403 Client Error: Forbidden for url: https://dashscope-result-sh.oss-cn-shanghai.aliyuncs.com/1d/8d/20260211/7147d395/6ff1f###14867d02.png?###
```
### Additional Information
This is my custom API's response
```json
{
"data": [
{
"url": "https://dashscope-result-sh.oss-cn-shanghai.aliyuncs.com/1d/7a/2####################################",
"b64_json": "",
"revised_prompt": ""
}
],
"created": 1770802551,
"metadata": {
"output": {
"choices": [
{
"finish_reason": "stop",
"message": {
"content": [
{
"image": "https://dashscope-result-sh.oss-cn-shanghai.aliyuncs.com/1d/7a/2####################################",
"type": "image"
}
],
"role": "assistant"
}
}
],
"finished": true
},
"usage": {
"image_count": 1,
"input_tokens": 0,
"output_tokens": 0,
"size": "1024*1024",
"total_tokens": 0
},
"request_id": "65555544-5157-4765-9e1d-0d06a9c550cf"
}
}
```
GiteaMirror
added the bug label 2026-05-05 22:20:13 -05:00
Blocking a user prevents them from interacting with repositories, such as opening or commenting on pull requests or issues. Learn more about blocking a user.
Originally created by @Randark-JMT on GitHub (Feb 11, 2026).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/21301
Check Existing Issues
Installation Method
Docker
Open WebUI Version
v0.7.2
Ollama Version (if applicable)
No response
Operating System
Ubuntu 22.04
Browser (if applicable)
Firefox 147.0.3
Confirmation
README.md.Expected Behavior
I used a routing transformation technique to convert the image generation model from a third-party vendor into an interface that conforms to the OpenAI API definition and provides it to Open-WebUI. Theoretically, this should work correctly and provide image generation capabilities.
Actual Behavior
However, Open-WebUI used the 'Content-Type': 'application/json' request header for the returned image URL, causing the model provider to refuse to respond.
Steps to Reproduce
wan2.6-t2ifrom Aliyun Bailian to a custom API which compliant with OpenAPI routing specificationsLogs & Screenshots
Backend Log:
Additional Information
This is my custom API's response
@tjbck commented on GitHub (Feb 23, 2026):
Should be addressed.