client.models.generate_content() does not honor http_options' httpx_client override

[Attila-Roomr]

Environment details

• Programming language: Python
• OS: Linux
• Language runtime version: 1.55.0
• Package version: 1.55.0

Steps to reproduce

1. _http_client = httpx.Client(transport = LogTransport(httpx.HTTPTransport()), event_hooks = {'request': [log_request]}) # Trying to capture what goes on the "wire" via the event hooks
2. _http_options = types.HttpOptions(httpx_client = _http_client, timeout = 30000)
3. _config=types.GenerateContentConfig(http_options=_http_options)
4. client.models.generate_content(config=_config)

The generate_content call does not honor the httpx_client override.
Looing at file _api_client.py, after line 1222, the relevant options are ignored. Adding something like:
try:
if http_options.httpx_client != None:
self._httpx_client = http_options.httpx_client
except:
pass
may enable that the overridden httpx_client is used.

[janasangeetha]

Hey @Attila-Roomr
Thank you for reporting this issue. To assist us in effectively investigating and reproducing it, please provide a minimal, runnable code example.

[github-actions]

This issue has been marked as stale because it has been open for 7 days with no activity. It will be closed in 2 days if no further activity occurs.

[Attila-Roomr]

I'll add a running example in a few days, Merry Christmas.

[Attila-Roomr]

import httpx

def log_request(request: httpx.Request):
    print(f"HttpRequest URL = '{request.url}'")

_http_client = httpx.Client(transport = LogTransport(httpx.HTTPTransport()), event_hooks = {'request': [log_request]})
_http_options = types.HttpOptions(api_version = 'v1beta1', httpx_client = _http_client, timeout = 30000)
_response = client.models.generate_content(
    model = "gemini-3-pro-preview",
    config = types.GenerateContentConfig(
        system_instruction = ["You are a usefule agent."],
        http_options = _http_options
        ),
    contents = [types.Content(parts = [types.Part(text="What is the meaning of life?")], role = "user")]
    )
print(_response.text)

In this example, when generate_content is called, you should see a print out of "HttpRequest URL = 'https://google....'" due to the http option event hook override, but it does not work, as the generate_content call does not honor the httpx_client override.
Again, Looking at file _api_client.py, after line 1222, the relevant options are ignored. Adding something like:

try:
if http_options.httpx_client != None:
self._httpx_client = http_options.httpx_client
except:
pass

may enable that the overridden httpx_client is used.

[janasangeetha]

@Attila-Roomr Thank you for your feedback. We appreciate you taking the time to share your thoughts with us, and we'll be filing a feature request.