"Invalid URL" error when adding remote HTTPS OpenAI-compatible provider in AI Agent Desktop 9.3.0.140

AI
1

Version: ONLYOFFICE Desktop Editors Community 9.3.0.140 (x64) - confirmed up to date

OS: Windows

I am trying to add a remote OpenAI-compatible AI provider in the AI Agent but get an “Invalid URL” error immediately when trying to save.

Steps to reproduce:

  1. Open ONLYOFFICE Desktop Editors 9.3
  2. Go to AI Agent - Settings - Connection - Add provider
  3. Select Provider: OpenAI Compatible
  4. Enter a name
  5. Enter URL: https://api.openai-compat.model-serving.eu01.onstackit.cloud/v1
  6. Enter a valid API key
  7. Click Add provider

Result: “Invalid URL” error. Provider cannot be saved.

Expected result: Provider is accepted and model list is fetched.

Additional finding: When I replace the URL with https://api.openai.com/v1 I get “Invalid API key” instead of “Invalid URL”. This proves the URL format is not the problem - the issue is that OnlyOffice is rejecting the STACKIT domain specifically.

The same STACKIT endpoint works correctly in Open WebUI and other OpenAI-compatible clients.

Note: There is no documentation for the “OpenAI Compatible” provider option in the Desktop AI Agent help center, so it is impossible to know what URL format or domains are expected.

2

Hello,
Thank you for the details!

First, please try entering the same endpoint without /v1 and check whether the provider can be saved that way.

Also, please try adding this endpoint via Custom providers instead of the built-in provider type. In ONLYOFFICE, custom providers are intended for cases where you need your own provider configuration, including endpoint URLs and headers, and the interface also offers a downloadable template for this setup. Please refer to our documentation: Adding custom providers.
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If neither approach works, please send us screenshots of both configurations with the API key hidden, and we will continue investigating.