Problem Statement

Rerank configuration does not support extra_headers, while embedding configuration does. This prevents users from using rerank services through API gateways that require custom headers (e.g., x-gw-apikey for my private api authentication). The current implementation dont support, and OpenAIRerankClient hardcodes request headers without merging additional headers.

Proposed Solution

as your decision

Alternatives Considered

No response

Feature Area

Core (Client/Engine)

Use Case

This allows configuration like:
{
"rerank": {
"api_base": "https://gateway.com/v1/rerank",
"api_key": "internal-key",
"extra_headers": {"x-gw-apikey": "Bearer real-key"}
}
}

Example API (Optional)

Additional Context

No response

Contribution

• I am willing to contribute to implementing this feature