[PR #16812] [CLOSED] Fix - Restore Claude Code Router compatibility ('list' object has no attribute 'replace') #39877

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GiteaMirror · 2026-04-25T12:18:44-05:00

GiteaMirror commented

2026-04-25 12:18:44 -05:00

📋 Pull Request Information

Original PR: https://github.com/open-webui/open-webui/pull/16812
Author: @igorhvr
Created: 8/22/2025
Status: ❌ Closed

Base: dev ← Head: dev

📝 Commits (1)

2916782 Fix - Restore Claude Code Router compatibility ('list' object has no attribute 'replace')

📊 Changes

4 files changed (+93 additions, -2 deletions)

View changed files

📝 backend/open_webui/main.py (+8 -0)
📝 backend/open_webui/routers/ollama.py (+14 -1)
📝 backend/open_webui/routers/openai.py (+13 -1)
📝 backend/open_webui/utils/payload.py (+58 -0)

📄 Description

Background / Problem:

Since Open WebUI v0.6.23, the OpenAI-compatible chat endpoints began assuming message.content and system are strings during preprocessing.

Claude Code Router (CCR) (and other Anthropic-style clients) legitimately send arrays of parts for messages[i].content (and sometimes system), e.g.:

{"role":"user","content":[{"type":"text","text":"Say OK"}]}

Open Web UI v0.6.22 tolerated this; v0.6.23 crashes with:

{"detail":"'list' object has no attribute 'replace'"}

because string ops (e.g., .replace, .strip) are applied to a list.

Goal: Make /api/chat/completions and /api/v1/chat/completions robust to string or array content for:

messages[i].content
top-level system (when provided)
messages[i].role == "system" messages

This is achieved by normalizing chat payload content.

Open web ui v0.6.23 example (the regression which breaks claude code router usage):

igorhvr:open-webui/ $ curl -s -X POST http://localhost:8000/api/v1/chat/completions
-H "Authorization: Bearer sk-ELIDED" -H "Content-Type: application/json"
-d '{"model":"ollama.gemma3:27b","messages":[
{"role":"system","content":[{"type":"text","text":"You are helpful."}]},
{"role":"user","content":[{"type":"text","text":"Say OK"}]}
]}'

{"detail":"'list' object has no attribute 'replace'"}%

Open web ui v0.6.22 example:
igorhvr:open-webui/ $ curl -s -X POST http://localhost:3000/api/v1/chat/completions
-H "Authorization: Bearer sk-ELIDED" -H "Content-Type: application/json"
-d '{"model":"ollama.gemma3:27b","messages":[
{"role":"system","content":[{"type":"text","text":"You are helpful."}]},
{"role":"user","content":[{"type":"text","text":"Say OK"}]}
]}'

{"id":"gemma3:27b-3809e0c6-bbc5-4666-b75a-342b04209700","created":1755855779,"model":"gemma3:27b","choices":[{"index":0,"logprobs":null,"finish_reason":"stop","message":{"role":"assistant","content":"OK.\n\n\n\nIs there anything I can help you with? 😊\n\n\n\n"}}],"object":"chat.completion","usage":{"response_token/s":2.43,"prompt_token/s":6.36,"total_duration":14312802695,"load_duration":4936762602,"prompt_eval_count":20,"prompt_tokens":20,"prompt_eval_duration":3143677971,"eval_count":15,"completion_tokens":15,"eval_duration":6171468695,"approximate_total":"0h0m14s","total_tokens":35,"completion_tokens_details":{"reasoning_tokens":0,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}}}%

Pull Request Checklist

Note to first-time contributors: Please open a discussion post in Discussions and describe your changes before submitting a pull request.

Re: I tried to document the exact details in the pull request. Please let me know if this still necessary.

Before submitting, make sure you've checked the following:

Target branch: Please verify that the pull request targets the dev branch.
Description: Provide a concise description of the changes made in this pull request.
Changelog: Ensure a changelog entry following the format of Keep a Changelog is added at the bottom of the PR description.
Documentation: Have you updated relevant documentation Open WebUI Docs, or other documentation sources?
Dependencies: Are there any new dependencies? Have you updated the dependency versions in the documentation?
Testing: Have you written and run sufficient tests to validate the changes?
This was NOT yet tested.
Code review: Have you performed a self-review of your code, addressing any coding standard issues and ensuring adherence to the project's coding standards?
Prefix: To clearly categorize this pull request, prefix the pull request title using one of the following:
- BREAKING CHANGE: Significant changes that may affect compatibility
- build: Changes that affect the build system or external dependencies
- ci: Changes to our continuous integration processes or workflows
- chore: Refactor, cleanup, or other non-functional code changes
- docs: Documentation update or addition
- feat: Introduces a new feature or enhancement to the codebase
- fix: Bug fix or error correction
- i18n: Internationalization or localization changes
- perf: Performance improvement
- refactor: Code restructuring for better maintainability, readability, or scalability
- style: Changes that do not affect the meaning of the code (white space, formatting, missing semi-colons, etc.)
- test: Adding missing tests or correcting existing tests
- WIP: Work in progress, a temporary label for incomplete or ongoing work

Contributor License Agreement

By submitting this pull request, I confirm that I have read and fully agree to the Contributor License Agreement (CLA), and I am providing my contributions under its terms.

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/open-webui/open-webui/pull/16812 **Author:** [@igorhvr](https://github.com/igorhvr) **Created:** 8/22/2025 **Status:** ❌ Closed **Base:** `dev` ← **Head:** `dev` --- ### 📝 Commits (1) - [`2916782`](https://github.com/open-webui/open-webui/commit/291678242360d74c2e05acb84f9a5bb56ddc80f6) Fix - Restore Claude Code Router compatibility ('list' object has no attribute 'replace') ### 📊 Changes **4 files changed** (+93 additions, -2 deletions) <details> <summary>View changed files</summary> 📝 `backend/open_webui/main.py` (+8 -0) 📝 `backend/open_webui/routers/ollama.py` (+14 -1) 📝 `backend/open_webui/routers/openai.py` (+13 -1) 📝 `backend/open_webui/utils/payload.py` (+58 -0) </details> ### 📄 Description Background / Problem: Since Open WebUI v0.6.23, the OpenAI-compatible chat endpoints began assuming message.content and system are strings during preprocessing. Claude Code Router (CCR) (and other Anthropic-style clients) legitimately send arrays of parts for messages[i].content (and sometimes system), e.g.: {"role":"user","content":[{"type":"text","text":"Say OK"}]} Open Web UI v0.6.22 tolerated this; v0.6.23 crashes with: {"detail":"'list' object has no attribute 'replace'"} because string ops (e.g., .replace, .strip) are applied to a list. Goal: Make /api/chat/completions and /api/v1/chat/completions robust to string or array content for: messages[i].content top-level system (when provided) messages[i].role == "system" messages This is achieved by normalizing chat payload content. Open web ui v0.6.23 example (the regression which breaks claude code router usage): igorhvr:open-webui/ $ curl -s -X POST http://localhost:8000/api/v1/chat/completions \ -H "Authorization: Bearer sk-ELIDED" -H "Content-Type: application/json" \ -d '{"model":"ollama.gemma3:27b","messages":[ {"role":"system","content":[{"type":"text","text":"You are helpful."}]}, {"role":"user","content":[{"type":"text","text":"Say OK"}]} ]}' {"detail":"'list' object has no attribute 'replace'"}% Open web ui v0.6.22 example: igorhvr:open-webui/ $ curl -s -X POST http://localhost:3000/api/v1/chat/completions \ -H "Authorization: Bearer sk-ELIDED" -H "Content-Type: application/json" \ -d '{"model":"ollama.gemma3:27b","messages":[ {"role":"system","content":[{"type":"text","text":"You are helpful."}]}, {"role":"user","content":[{"type":"text","text":"Say OK"}]} ]}' {"id":"gemma3:27b-3809e0c6-bbc5-4666-b75a-342b04209700","created":1755855779,"model":"gemma3:27b","choices":[{"index":0,"logprobs":null,"finish_reason":"stop","message":{"role":"assistant","content":"OK.\n\n\n\nIs there anything I can help you with? 😊\n\n\n\n"}}],"object":"chat.completion","usage":{"response_token/s":2.43,"prompt_token/s":6.36,"total_duration":14312802695,"load_duration":4936762602,"prompt_eval_count":20,"prompt_tokens":20,"prompt_eval_duration":3143677971,"eval_count":15,"completion_tokens":15,"eval_duration":6171468695,"approximate_total":"0h0m14s","total_tokens":35,"completion_tokens_details":{"reasoning_tokens":0,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}}}% # Pull Request Checklist ### Note to first-time contributors: Please open a discussion post in [Discussions](https://github.com/open-webui/open-webui/discussions) and describe your changes before submitting a pull request. Re: I tried to document the exact details in the pull request. Please let me know if this still necessary. **Before submitting, make sure you've checked the following:** - [X] **Target branch:** Please verify that the pull request targets the `dev` branch. - [X] **Description:** Provide a concise description of the changes made in this pull request. - [X] **Changelog:** Ensure a changelog entry following the format of [Keep a Changelog](https://keepachangelog.com/) is added at the bottom of the PR description. - [X] **Documentation:** Have you updated relevant documentation [Open WebUI Docs](https://github.com/open-webui/docs), or other documentation sources? - [X] **Dependencies:** Are there any new dependencies? Have you updated the dependency versions in the documentation? - - [ ] **Testing:** Have you written and run sufficient tests to validate the changes? This was NOT yet tested. - [X] **Code review:** Have you performed a self-review of your code, addressing any coding standard issues and ensuring adherence to the project's coding standards? - [X] **Prefix:** To clearly categorize this pull request, prefix the pull request title using one of the following: - **BREAKING CHANGE**: Significant changes that may affect compatibility - **build**: Changes that affect the build system or external dependencies - **ci**: Changes to our continuous integration processes or workflows - **chore**: Refactor, cleanup, or other non-functional code changes - **docs**: Documentation update or addition - **feat**: Introduces a new feature or enhancement to the codebase - **fix**: Bug fix or error correction - **i18n**: Internationalization or localization changes - **perf**: Performance improvement - **refactor**: Code restructuring for better maintainability, readability, or scalability - **style**: Changes that do not affect the meaning of the code (white space, formatting, missing semi-colons, etc.) - **test**: Adding missing tests or correcting existing tests - **WIP**: Work in progress, a temporary label for incomplete or ongoing work ### Contributor License Agreement By submitting this pull request, I confirm that I have read and fully agree to the [Contributor License Agreement (CLA)](/CONTRIBUTOR_LICENSE_AGREEMENT), and I am providing my contributions under its terms. --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

GiteaMirror added the pull-request label 2026-04-25 12:18:44 -05:00

GiteaMirror closed this issue

2026-04-25 12:18:46 -05:00

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Reference: github-starred/open-webui#39877