Introduces a mitmproxy-based recording HTTP/HTTPS sidecar that any CI
job can opt into to cache LLM-provider responses across runs. Unlike
the in-process VCR persister at tests/_vcr_redis_persister.py — which
can only intercept HTTP traffic from the same Python process where it
was loaded — this sidecar operates at the network layer, so it works
for any e2e job whose system-under-test runs in a Docker container
(every job under e2e_*, proxy_*, etc.).
Components
- tests/e2e_cassette_proxy/cache_key.py: pure-function cache-key
derivation. Hashes (method, scheme, host, path, sorted query,
allowlisted headers, canonical-JSON body); strips auth, tracing,
and SDK-metadata headers so equivalent requests collide regardless
of run-to-run noise.
- tests/e2e_cassette_proxy/redis_store.py: thin Redis wrapper that
stores one (request, response) pair per key as MessagePack
(JSON+base64 fallback). Caps per-key payload size, drops oversize
responses with a log line, and never blocks the request path on
Redis errors.
- tests/e2e_cassette_proxy/addon.py: mitmproxy addon that ties the
two together. Hosts on the passthrough list (localhost, the proxy
itself) are never cached; non-2xx upstream responses are not
persisted.
- tests/e2e_cassette_proxy/Dockerfile: pinned python:3.12-slim base +
pinned mitmproxy 11.0.2 + pinned redis-py + pinned msgpack.
- tests/e2e_cassette_proxy/trust_ca.sh: helper for SUT containers to
trust the proxy CA in every Python / curl / boto3 / node trust
store at once.
- tests/e2e_cassette_proxy/README.md: usage guide + opt-in checklist
for other e2e jobs.
CI integration
- New reusable command 'start_cassette_proxy' in .circleci/config.yml.
Builds the image, runs the sidecar wired to the project Redis, fetches
the proxy CA, and exports CASSETTE_PROXY_URL / CASSETTE_PROXY_CA into
$BASH_ENV for downstream steps.
- e2e_openai_endpoints is wired up as the canonical demo: two-line opt-in
pattern documented in the README.
- Job logs include a 'Cassette-proxy stats' step that dumps the
hit/miss/store summary via 'docker logs cassette-proxy | grep
[E2ECASS]'.
Tests
- 31 hermetic unit tests under tests/test_litellm/e2e_cassette_proxy:
- test_cache_key.py: 14 tests pinning equivalence-class behavior of
the key derivation (auth header, tracing header, JSON key order,
query order, host case all collapse; method/path/body/allowlisted
headers / query-param values do not).
- test_redis_store.py: 9 tests covering set/get round-trip, default
TTL, binary body round-trip, oversize-payload rejection, corrupt-
blob eviction, and graceful behavior when the Redis client raises.
- test_addon.py: 8 tests using a fake-mitmproxy flow to exercise
the addon end-to-end (passthrough miss, persist on 2xx, hit on
canonicalized-equivalent re-request, no-persist on 5xx, host
passthrough, replay-only 599-on-miss, record-only never serves
cache).
- 31/31 pass.
Co-authored-by: Mateo Wang <mateo-berri@users.noreply.github.com>
The async/sync delete_response_api_handler always passed json=data into
httpx.delete, where data is {} from the transformer. httpx serializes that
to a 2-byte body. The Azure Responses DELETE endpoint now rejects any
request body with code: unexpected_body, breaking
test_basic_openai_responses_delete_endpoint on the llm_responses_api_testing
job. Build the kwargs dict and only set json= when data is truthy.
Add unit tests that patch httpx.delete and assert json/data are not in the
captured kwargs for the Azure DELETE path (sync and async).
The proxy's ingress hardening (commit 842eea0131) now strips client-supplied
`mock_response` from the request body unless the calling key or team has the
`allow_client_mock_response: true` admin-metadata flag set. The e2e model
access tests rely on `mock_response` to short-circuit the LLM call, so without
the flag they hit real backends — the bedrock wildcard route fakes out to a
shared example endpoint that now 404s on unsupported paths, causing
`test_model_access_patterns[key_models2-bedrock/anthropic.claude-3-True]`
(and the bedrock/anthropic.* row that pytest -x never reaches) to fail.
Set `allow_client_mock_response: true` on every key and team this test file
provisions so `mock_response` is preserved end-to-end.
Cover the full litellm.rerank()/arerank() path with HTTP mocked, asserting
metadata.requester_metadata reaches the Discovery Engine :rank body as
userLabels (and stays absent when no metadata is set). Catches plumbing
regressions that unit tests on transform_rerank_request alone would miss.
The wrapper had no production callers after transform_parsed_response
was refactored to call _resolve_json_mode_non_streaming directly.
Updated the parametrized test to call the underlying method.
