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09.24.2025
This feature allows users to add custom HTTP headers to playground requests, enabling injection of provider-specific metadata (e.g. request IDs) via a JSON editor in the model config panel. The change extends the GenerativeModelInput schema to include customHeaders, with validation, per-provider storage, and conditional support.

feat(playground): custom http headers for playground requests by RogerHYang · Pull Request #9560 · Arize-ai/phoenixGitHub

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