Originally created by @AlexanderZhk on GitHub (Mar 27, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/12128
### Check Existing Issues
- [x] I have searched the existing issues and discussions.
- [x] I am using the latest version of Open WebUI.
### Installation Method
Docker
### Open WebUI Version
v0.5.20
### Ollama Version (if applicable)
_No response_
### Operating System
Ubuntu 24.04 LTS
### Browser (if applicable)
_No response_
### 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 listed steps to reproduce the bug in detail.
### Expected Behavior
When using a self-hosted OpenAI compatible whisper API, requests should look like this:
```
POST http://localhost:8082/v1/audio/transcriptions HTTP/1.1
User-Agent: PostmanRuntime/7.37.3
Accept: */*
Host: localhost:8082
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Content-Type: multipart/form-data; boundary=--------------------------664682140530690538634952
Content-Length: 728400
----------------------------664682140530690538634952
Content-Disposition: form-data; name="file"; filename="Recording (37) (1).wav"
Content-Type: audio/wave
[...]
```
Please notice the `Content-Type: audio/wave` header.
### Actual Behavior
Requests sent from OWIU are missing the `Content-Type: audio/wave` header:
```
POST http://host.docker.internal:8082/v1/audio/transcriptions HTTP/1.1
Host: host.docker.internal:8082
User-Agent: python-requests/2.32.3
Accept-Encoding: gzip, deflate, zstd
Accept: */*
Connection: keep-alive
Authorization: Bearer 123
Content-Length: 30677
Content-Type: multipart/form-data; boundary=df57d76b425c4d856b30788f6804aec4
--df57d76b425c4d856b30788f6804aec4
Content-Disposition: form-data; name="model"
./cache\\cache\\huggingface\\models--Systran--faster-whisper-small\\snapshots\\536b0662742c02347bc0e980a01041f333bce120
--df57d76b425c4d856b30788f6804aec4
Content-Disposition: form-data; name="file"; filename="4e56d23f-7825-455c-ab27-47c3ed12aa08.wav"
[...]
```
### Steps to Reproduce
1. Deploy [VoxBox](https://github.com/gpustack/vox-box)
2. Add it as an OpenAI compatible STT model in the OWUI admin panel
3. Use the STT functionality via:
https://github.com/open-webui/open-webui/blob/b03fc97e287f31ad07bda896143959bc4413f7d2/backend/open_webui/routers/audio.py#L511
### Logs & Screenshots
### Additional Information
This is critical, when using [VoxBox](https://github.com/gpustack/vox-box).
Changing
https://github.com/open-webui/open-webui/blob/b03fc97e287f31ad07bda896143959bc4413f7d2/backend/open_webui/routers/audio.py#L511
to
```
files={"file": (filename, open(file_path, "rb"),"audio/wave")},
```
seems to fix it.
GiteaMirror
added the bug label 2026-05-18 00:55:09 -05:00
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Originally created by @AlexanderZhk on GitHub (Mar 27, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/12128
Check Existing Issues
Installation Method
Docker
Open WebUI Version
v0.5.20
Ollama Version (if applicable)
No response
Operating System
Ubuntu 24.04 LTS
Browser (if applicable)
No response
Confirmation
README.md.Expected Behavior
When using a self-hosted OpenAI compatible whisper API, requests should look like this:
Please notice the
Content-Type: audio/waveheader.Actual Behavior
Requests sent from OWIU are missing the
Content-Type: audio/waveheader:Steps to Reproduce
https://github.com/open-webui/open-webui/blob/b03fc97e287f31ad07bda896143959bc4413f7d2/backend/open_webui/routers/audio.py#L511
Logs & Screenshots
Additional Information
This is critical, when using VoxBox.
Changing
https://github.com/open-webui/open-webui/blob/b03fc97e287f31ad07bda896143959bc4413f7d2/backend/open_webui/routers/audio.py#L511
to
seems to fix it.
@tjbck commented on GitHub (Mar 28, 2025):
Content-Typeis not required for OpenAI whisper.