Please add an option to specify a custom base URL when creating an LLM client in Java ADK (similar to how OpenAI and Spring AI SDKs allow baseUrl configuration).

[iamkaustubh1910]

In the current Java ADK, the Gemini client is hard-coded to Google’s public endpoints.
My company requires routing all LLM traffic through a proxy (LiteLLM), which exposes the same API but at a custom base URL.

Right now there is no way to configure or override the base URL in ADK, which makes it impossible to use ADK’s tool-calling and agent features in such environments.