issue: Error if Application Header is not set to json when using API #138

New Issue

2026-02-15T17:15:17-05:00

yindo commented

2026-02-15 17:15:17 -05:00

Originally created by @maurerle on GitHub (Dec 8, 2025).

Check Existing Issues

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

v0.6.41

Ollama Version (if applicable)

v0.13.0

Operating System

Debian 13

Browser (if applicable)

Firefox

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

Using:

curl -H "Authorization: Bearer XXX" http://localhost:8080/ollama/api/generate -d '{
 "model": "mistral:latest",
 "prompt": "Why is the sky blue?"
}'

should work fine as it is specified in the docs:
https://docs.openwebui.com/getting-started/api-endpoints/#-generate-completion-streaming

Actual Behavior

{"detail":[{"type":"model_attributes_type","loc":["body"],"msg":"Input should be a valid dictionary or object to extract fields from","input":"{\n \"model\": \"mistral:latest\",\n \"prompt\": \"Why is the sky blue?\"\n}"}]}% error

Only adding -H 'Content-Type: application/json'

curl -H 'Content-Type: application/json' -H "Authorization: Bearer XXX" http://localhost:8080/ollama/api/generate -d '{
 "model": "mistral:latest",
 "prompt": "Why is the sky blue?"
}'

works

Steps to Reproduce

run the example from the docs using the local ollama api through open-webui as specified here:
https://docs.openwebui.com/getting-started/api-endpoints/#-generate-completion-streaming
see the error
unhappy

Logs & Screenshots

given above

Additional Information

No response

Originally created by @maurerle on GitHub (Dec 8, 2025). ### 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 v0.6.41 ### Ollama Version (if applicable) v0.13.0 ### Operating System Debian 13 ### Browser (if applicable) Firefox ### 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 Using: ``` curl -H "Authorization: Bearer XXX" http://localhost:8080/ollama/api/generate -d '{ "model": "mistral:latest", "prompt": "Why is the sky blue?" }' ``` should work fine as it is specified in the docs: https://docs.openwebui.com/getting-started/api-endpoints/#-generate-completion-streaming ### Actual Behavior `{"detail":[{"type":"model_attributes_type","loc":["body"],"msg":"Input should be a valid dictionary or object to extract fields from","input":"{\n \"model\": \"mistral:latest\",\n \"prompt\": \"Why is the sky blue?\"\n}"}]}%` error Only adding `-H 'Content-Type: application/json'` ``` curl -H 'Content-Type: application/json' -H "Authorization: Bearer XXX" http://localhost:8080/ollama/api/generate -d '{ "model": "mistral:latest", "prompt": "Why is the sky blue?" }' ``` works ### Steps to Reproduce 1. run the example from the docs using the local ollama api through open-webui as specified here: https://docs.openwebui.com/getting-started/api-endpoints/#-generate-completion-streaming 2. see the error 3. unhappy ### Logs & Screenshots given above ### Additional Information _No response_

yindo added the bug label 2026-02-15 17:15:17 -05:00

yindo closed this issue

2026-02-15 17:15:17 -05:00

yindo commented

2026-02-15 17:15:18 -05:00

@owui-terminator[bot] commented on GitHub (Dec 8, 2025):

🔍 Similar Issues Found

I found some existing issues that might be related to this one. Please check if any of these are duplicates or contain helpful solutions:

#19755 issue: Error: 404, message='Not Found', url='http://ollama:11434/api/embed'
by stevewillett • Dec 04, 2025 • bug
#19777 issue:
by Yaute7 • Dec 05, 2025 • bug
#19563 issue:
by naruto7g • Nov 28, 2025 • bug
#19230 issue: Open WebUI 0.6.36 Unexpected token 'd', "data: {"id"... is not valid JSON returned.
by abhijit4law • Nov 17, 2025 • bug
#19017 issue: OPENAI_API_CONFIGS and OLLAMA_API_CONFIGS environment variables are not parsed from JSON
by runixer • Nov 07, 2025 • bug

Show 5 more related issues

#19211 issue:
by Byrnes9 • Nov 16, 2025 • bug
#19417 issue: v0.6.37 SQL Error
by AKHYP • Nov 24, 2025 • bug
#15911 issue: Tools : JSON malformed
by chdid • Jul 21, 2025 • bug
#14908 issue: 401 x-api-key header is required web search
by deresolution20 • Jun 11, 2025 • bug
#19496 issue: 500 internal server error appears in v0.6.40
by cloudtuotuo • Nov 26, 2025 • bug

💡 Tips:

If this is a duplicate, please consider closing this issue and adding any additional details to the existing one
If you found a solution in any of these issues, please share it here to help others

This comment was generated automatically by a bot. Please react with a 👍 if this comment was helpful, or a 👎 if it was not.

@owui-terminator[bot] commented on GitHub (Dec 8, 2025): 🔍 **Similar Issues Found** I found some existing issues that might be related to this one. Please check if any of these are duplicates or contain helpful solutions: 1. [#19755](https://github.com/open-webui/open-webui/issues/19755) **issue: Error: 404, message='Not Found', url='http://ollama:11434/api/embed'** *by stevewillett • Dec 04, 2025 • `bug`* 2. [#19777](https://github.com/open-webui/open-webui/issues/19777) **issue:** *by Yaute7 • Dec 05, 2025 • `bug`* 3. [#19563](https://github.com/open-webui/open-webui/issues/19563) **issue:** *by naruto7g • Nov 28, 2025 • `bug`* 4. [#19230](https://github.com/open-webui/open-webui/issues/19230) **issue: Open WebUI 0.6.36 Unexpected token 'd', "data: {"id"... is not valid JSON returned.** *by abhijit4law • Nov 17, 2025 • `bug`* 5. [#19017](https://github.com/open-webui/open-webui/issues/19017) **issue: OPENAI_API_CONFIGS and OLLAMA_API_CONFIGS environment variables are not parsed from JSON** *by runixer • Nov 07, 2025 • `bug`* <details> <summary>Show 5 more related issues</summary> 6. [#19211](https://github.com/open-webui/open-webui/issues/19211) **issue:** *by Byrnes9 • Nov 16, 2025 • `bug`* 7. [#19417](https://github.com/open-webui/open-webui/issues/19417) **issue: v0.6.37 SQL Error** *by AKHYP • Nov 24, 2025 • `bug`* 8. [#15911](https://github.com/open-webui/open-webui/issues/15911) **issue: Tools : JSON malformed** *by chdid • Jul 21, 2025 • `bug`* 9. [#14908](https://github.com/open-webui/open-webui/issues/14908) **issue: 401 x-api-key header is required web search** *by deresolution20 • Jun 11, 2025 • `bug`* 10. [#19496](https://github.com/open-webui/open-webui/issues/19496) **issue: 500 internal server error appears in v0.6.40** *by cloudtuotuo • Nov 26, 2025 • `bug`* </details> --- 💡 **Tips:** - If this is a duplicate, please consider closing this issue and adding any additional details to the existing one - If you found a solution in any of these issues, please share it here to help others *This comment was generated automatically by a bot.* Please react with a 👍 if this comment was helpful, or a 👎 if it was not.

yindo commented

2026-02-15 17:15:18 -05:00

@tjbck commented on GitHub (Dec 8, 2025):

Intended, @silentoplayz our docs should be updated.

@tjbck commented on GitHub (Dec 8, 2025): Intended, @silentoplayz our docs should be updated.

yindo commented

2026-02-15 17:15:18 -05:00

@Classic298 commented on GitHub (Dec 20, 2025):

edited docs\getting-started\api-endpoints.md in dev

@Classic298 commented on GitHub (Dec 20, 2025): edited docs\getting-started\api-endpoints.md in dev

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Reference: open-webui/docs#138