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description: Available in Phoenix 11.36+
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# 09.24.2025: Custom HTTP headers for requests in Playground 🛠️
{% embed url="https://storage.googleapis.com/arize-phoenix-assets/assets/images/custom-headers-playground.png" %}
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. 
{% embed url="https://github.com/Arize-ai/phoenix/pull/9560" %}