google-genai: support of adding custom headers on ChatGoogleGenerativeAI

[mingshun]

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Feature request

support of adding custom headers on ChatGoogleGenerativeAI

Motivation

My code invokes google genai api by langchain is behind a proxy. I want to add custom headers to perform some data collection on the proxy.

Proposal (If applicable)

The version of @google/generative-ai which @langchain/google-genai depends on is too old. Starting from 0.11.0, @google/generative-ai adds customHeaders field to RequestOptions inteface. Maybe it can be used by ChatGoogleGenerativeAI to support adding custom headers.

[agn-7]

any update here?

[agn-7]

I raised the same question in the langchgain forum:

https://forum.langchain.com/t/how-to-append-a-new-key-value-to-the-header-produced-by-chatgooglegenerativeai-in-langchain/499

[SkrOYC]

As far as I can see, the current @langchain/google-genai package depends on @google/generative-ai which is already legacy.
The whole package must be migrated to the new package