Ensure proxies and timeout options are handled correctly

[richdawe-cio]

Summary

• The proxies option on the Client constructor was accepted but never actually passed to the underlying requests session. The post() function in request.py built a kwargs dict containing proxies, but then called _session.post() with individual named arguments instead of using that dict.
• Fixed by calling _session.post(url, **kwargs) so all options (including proxies) flow through.
• Also fixed a latent bug where timeout was hardcoded to 15 in the kwargs dict instead of using the timeout parameter.
• Replaced the existing proxy tests (which didn't actually verify proxies reached the HTTP layer) with tests that mock _session.post and assert proxies is present in the call arguments.

Test plan

• test_proxies_passed_to_session — verifies proxies dict reaches _session.post via post()
• test_no_proxies_by_default — verifies proxies is omitted when not set
• TestClient.test_proxies — verifies proxies flows end-to-end from Client constructor through to _session.post
• Full test suite passes

I made these changes.

🤖 Generated with Claude Code

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Note

Medium Risk
Changes affect all batch uploads (timeout/proxy behavior); fixes are straightforward but touch the critical outbound HTTP path customers rely on.

Overview
HTTP upload options were silently ignored: post() built a kwargs dict with proxies and timeout but called _session.post() with separate arguments, so Client proxy settings never reached the wire. The call now uses _session.post(url, **kwargs), and the request kwargs use the timeout parameter instead of a hardcoded 15. proxies is only added when not None.

Proxy-related tests now mock _session.post and assert proxies is present or omitted; consumer proxy coverage checks stored config. Minor test tweaks add upload_interval coverage and stabilize batch timing. AGENTS.md documents opening PRs against customerio/cdp-analytics-python; CLAUDE.md points agents at that file.

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[sydneycollins-cio]

LGTM, minor nits inline.

[sydneycollins-cio]

Non-blocking. proxies is only added to kwargs when truthy, so proxies={} silently drops it while the other options are always included. Either document that an empty dict means no proxy, or use if proxies is not None to be explicit.

[richdawe-cio]

OK will make this explicit

[sydneycollins-cio]

Non-blocking. Is the upload_interval=3 → 0.3 change intentional? Looks unrelated to the proxy/timeout fix — if it is a test speed improvement, a comment would make it clear.

[richdawe-cio]

Will add comment, thanks.