Custom API server did not respond

Hi Vowen team,

I’m trying to connect a local OpenAI-compatible endpoint via “Custom API (OpenAI-compatible)”, but the Connect step fails with:

“Custom API server did not respond to either chat/completions or responses format. Check your Base URL and model name.”

My config in Vowen:

• Base URL: http://127.0.0.1:20128 (also tested with /v1)

• Default model: kr/claude-sonnet-4.5

• API key: tested both empty and provided

The backend is reachable and responds correctly:

1. GET /v1/models returns a valid model list including:

• kr/claude-sonnet-4.5

• kiro/claude-sonnet-4.5

• kr/claude-haiku-4.5

• kiro/claude-haiku-4.5

2. POST /v1/chat/completions returns valid OpenAI-style responses.

3. POST /v1/responses returns valid OpenAI Responses API output.

From testing, it looks like the connection validator may be rejecting valid OpenAI-compatible responses in this setup (possibly related to streaming/SSE handling or strict response parsing during Connect).

Could you please confirm what exact validation request Vowen sends during Connect and what response shape/content-type it expects?

I can provide full request/response samples if needed.