extractBaseURL() breaks deep nested baseURL like Huawei Cloud ModelArts Studio

[ks4na]

What happened?

The function extractBaseURL() in LibreChat assumes /v1 is the consistent entry point and attempts to truncate anything beyond that. However, some providers (such as HuaweiCloud ModelArts Studio + DeepSeek-R1) use deeper paths with /v1 appearing multiple times.

Example real API endpoint (UUID masked):

https://maas-cn-southwest-2.modelarts-maas.com/v1/infers/{uuid}/v1/chat/completions

When this is passed as baseURL, extractBaseURL() wrongly shortens it to:

https://maas-cn-southwest-2.modelarts-maas.com/v1

which leads to a 404 error from the API server.

Version Information

$ sudo docker images | grep librechat
ghcr.io/danny-avila/librechat-dev                latest    b74cbb915050   17 hours ago    1.03GB
ghcr.io/danny-avila/librechat-rag-api-dev-lite   latest    e78acb5d033c   2 weeks ago     1.28GB

Steps to Reproduce

1. Configure a custom provider like this:

  custom:
    - name: "Deepseek"
      apiKey: "user_provided"
      baseURL: "https://maas-cn-southwest-2.modelarts-maas.com/v1/infers/{uuid}/v1"
      models:
        default: ["DeepSeek-R1"]

2. Start LibreChat and go to the chat interface.

3. Select the custom provider “Deepseek” and enter a prompt like "Hello".

4. Observe that the UI displays a error message.

5. Check the server debug logs:

Making request to https://maas-cn-southwest-2.modelarts-maas.com/v1/chat/completions
...
[AskController] Error handling request 404 status code (no body)
[handleAbortError] AI response error; aborting request: 404 status code (no body)

What browsers are you seeing the problem on?

No response

Relevant log output

debug logs:


025-05-26T12:17:08.772Z debug: Making request to https://maas-cn-southwest-2.modelarts-maas.com/v1/chat/completions
2025-05-26T12:17:08.781Z debug: [saveConvo] api/app/clients/BaseClient.js - saveMessageToDatabase #saveConvo
2025-05-26T12:17:08.912Z warn: [OpenAIClient.chatCompletion][stream] API error
2025-05-26T12:17:08.913Z error
2025-05-26T12:17:08.914Z error: [AskController] Error handling request 404 status code (no body)
2025-05-26T12:17:08.914Z error: [handleAbortError] AI response error; aborting request: 404 status code (no body)
2025-05-26T12:17:08.926Z debug: [AskController] Performing cleanup
2025-05-26T12:17:08.926Z debug: [AskController] Cleaning up abort controller
2025-05-26T12:17:08.926Z debug: [AskController] Cleanup completed
2025-05-26T12:17:35.838Z debug: [indexSync] Clearing sync timeouts before exiting...

Screenshots

No response

Code of Conduct

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[danny-avila]

Not all URL patterns are supported out of the box. In this case, you need to make use of directEndpoint:

https://www.librechat.ai/docs/configuration/librechat_yaml/object_structure/custom_endpoint#directendpoint