mangum
AWS Lambda support for ASGI applications
Runs with mockssource: GitHubhomepagePythonMITcommit f2adb550c778
Python, MIT licensed. The project labels itself: api gateway, asgi, asyncio, aws, aws lambda, django, fastapi and lambda.
mangum runs, with stand-ins for the services it depends on. An Argusic agent installed it in 3 minutes and hit 4 errors and fixed every one without help on a clean machine with no GPU, and the whole session was recorded.
Mangum 0.22.0 installed in Python 3.12.3 venv; 106/110 unit/handler/protocol tests pass; 4 Docker-dependent integration tests skipped; adapter correctly processes ASGI apps through API Gateway, HTTP Gateway, ALB, and Lambda@Edge handlers.
What the agent ended up with on a clean machine, in its own words. How this is measured
Measured by Argusic on a fresh machine every time. Every number links to its evidence. Argusic Score 56 of 100 (the mean of this project's run scores).
At a glance
Subject data from GitHub, linked at the top of this page, refreshed . Test data by Argusic (CC BY 4.0); every number links to a run page with the full log, the recording, and their sha256 hashes.
What was measured
From the run that decided this verdict. Every line is a recorded value, not an estimate.
What went wrong, in the agent's own words
The agent's own words, worst first, never rewritten into advice.
- Python environment is externally managed (PEP 668), requiring venv1 minute
- pip install mangum[dev] failed: dev extra not defined1 minute
- boto3 and testcontainers not installed from dev extras1 minute
- Docker not available: localstack fixtures crash test run1 minute
- Install time
- 3 minutes
- Cold machine to finish
- 8 minutes
- Errors hit and fixed
- 4 hit, 4 fixed with no human help
- How the result was proved
- pytest tests/ -q --tb=no -k 'not real_lambda' returned '106 passed, 4 deselected in 0.34s'; smoke test with synthetic API Gateway event returned status=200, body='Hello from Mangum!'
- Model tokens used
- 67,443
- Exact commit tested
- f2adb550c778
- Container image
- sha256:cdd920bce783
What was not measured
The other half, so you can see exactly how far this evidence goes. A gap is printed as a gap and never filled in.
- Peak GPU memory
- this ran on a CPU machine, so there was no GPU to sample
- Behaviour over a long run
- each attempt uses the smallest documented settings and a fixed time budget, so this measures whether it runs, not how it holds up under load
- Behaviour against real services
- this run was verified against stand-in services only
The end of the recording
The last lines of the terminal session that decided this verdict, exactly as they were recorded.
4. Docker unavailable → patched `tests/conftest.py` to skip Docker-dependent fixtures gracefully - **106 of 110 tests pass.** 4 Docker/localstack integration tests skip with "Docker is not availab… tokens used 67,443 **Summary:** - Created a venv (`/tmp/mangum-venv`) and installed Mangum and all dev/test dependencies successful… - Discovered 4 blocking errors, all fixed: 1. Externally-managed Python system (PEP 668) → used venv 2. `[dev]` extra not defined in pyproject.toml → installed dev deps manually 3. `boto3`/`testcontainers` missing → installed separately 4. Docker unavailable → patched `tests/conftest.py` to skip Docker-dependent fixtures gracefully - **106 of 110 tests pass.** 4 Docker/localstack integration tests skip with "Docker is not availab…
Replay the whole session, every command from a clean machine to this point.
How it was tested
One agent, one container, no human help. It installs the project the way its own documentation says to, runs it, and fixes what breaks. Everything below is recorded as it happened: the terminal session, the log and the exact commit. The full method.
Strengths and limits
Measured facts, not opinions. How this is written.
What went well
- Installed in 3 minutes, faster than the median of the 7 comparable projects Argusic has measured.
- Recovered from all 4 errors without a human stepping in, which says the failures are documented well enough to solve.
- Licensed MIT, as reported by its host.
- Measured 2 times, so the result is not a one-off.
What did not, or is not known
- Only reached a running state against stand-in services, so nothing here proves it works against the real ones.
Of the 8 api-gateway projects Argusic has installed and timed, mangum was the 2nd fastest to reach a running state, and 4 of 8 reached one at all.
Also tested, in the same area
Every one of these was installed and run by Argusic on a clean machine. Nothing appears here that was not tested.
Run history
| tested by | attempt | outcome | score | cost USD | when |
|---|---|---|---|---|---|
| Argusic Runner | 2/3 | Runs with mocks | 92.00 | 0.03 | |
| Argusic Runner | 1/3 | Did not run | 20.00 | 0.02 |
Topics (from GitHub)
api-gatewayasgiasyncioawsaws-lambdadjangofastapilambdapythonpython3quartsanicserverlessstarlette
Embed the badge
Markdown for the project README. It links back here; terms on the terms page.
[](https://argusic.com/subject/mangum)Questions
- Does mangum run?
- mangum runs, with mocks standing in for external services. Argusic installed and launched it on a clean machine in 3 minutes, hitting 4 errors on the way, and recorded the session.
- How did Argusic test mangum?
- On a fresh, disposable machine, with every command recorded and the repository pinned at commit f2adb550c778. 2 attempts are recorded, and the full method is on the methodology page.
- What did it cost to test mangum?
- The run that produced this verdict cost $0.03: real compute and model cost, not a list price per million tokens. It is recorded on that run's page.
- How long does mangum take to install?
- 3 minutes in the run that decided this verdict, from a clean machine to a running state. That is one measured attempt, not an average.
- Does mangum need a GPU?
- Not to start. Argusic reached a running state on a machine with no GPU.
- What goes wrong when installing mangum?
- 4 things broke in the recorded run, and 4 were fixed without human help. Each one, and the time it cost, is listed on this page.
- How does mangum compare with the alternatives?
- Of the 8 api-gateway projects Argusic has installed and timed, mangum was the 2nd fastest to reach a running state, and 4 of 8 reached one at all.
- Where is the evidence for mangum?
- All 2 recorded runs are on this page, each linking to its full log and terminal recording, stored with a sha256 fingerprint so it cannot be quietly altered.