Interactions retries ignore the documented initial_delay and max_delay defaults #3317

import time, httpx2
from google import genai
from google.genai import types

stamps = []
def handler(request):
    stamps.append(time.monotonic())
    return httpx2.Response(503, json={"error": {"code": 503, "message": "unavailable", "status": "UNAVAILABLE"}})

def gaps():
    return [round(b - a, 1) for a, b in zip(stamps, stamps[1:])]

retry = types.HttpRetryOptions(attempts=4, jitter=0)  # jitter=0 keeps the gaps exact; delays left unset
client = genai.Client(
    api_key="test",
    http_options=types.HttpOptions(
        retry_options=retry, httpx_client=httpx2.Client(transport=httpx2.MockTransport(handler))
    ),
)
for name, call in [
    ("models.generate_content", lambda: client.models.generate_content(model="gemini-3.8-flash", contents="hi")),
    ("interactions.create", lambda: client.interactions.create(model="gemini-3.8-flash", input="hi")),
]:
    stamps.clear()
    try:
        call()
    except Exception as e:
        print(f"{name}: {len(stamps)} requests, gaps {gaps()} s, {type(e).__name__}")