Supporting `fetch` and `httpAgent` in `ClientOptions`

[huytool157]

Description of the feature request:

OpenAI and Anthropic has these following props inside ClientOptions that Google doesn't

  /**
   * An HTTP agent used to manage HTTP(S) connections.
   *
   * If not provided, an agent will be constructed by default in the Node.js environment,
   * otherwise no agent is used.
   */
  httpAgent?: Agent;

  /**
   * Specify a custom `fetch` function implementation.
   *
   * If not provided, we use `node-fetch` on Node.js and otherwise expect that `fetch` is
   * defined globally.
   */
  fetch?: Core.Fetch | undefined;

What problem are you trying to solve with this feature?

Customers want to point to their own proxy agents rather than a plain baseUrl.

Any other information you'd like to share?

This is also better for security as you can use something like ssrf-req-filter to filter out attacks

[akhileshdasari2004]

hey @huytool157 is the issue still open ? can You assign this to me

[wujohns]

Because of the arrogance of the Google team, they will not support this feature