Antigravity OpenAI-Compatible Proxy

A small FastAPI reverse proxy that passes OpenAI-compatible /v1/* requests directly to the local Antigravity listener at http://127.0.0.1:8901/v1. It preserves the requested model name and request body, and streams Server-Sent Events. Antigravity CLI/service owns sign-in and OAuth; this proxy does not obtain credentials or alter model names. If Antigravity is signed in, its listener handles the authenticated request.

Run on Termux (Android)

Install Python and unzip in Termux if needed:

pkg update
pkg install python unzip

Unzip the project, enter its folder, install the package and dependencies, then start it:

unzip antigravity-proxy.zip
cd antigravity-proxy
cp .env.example .env
python -m pip install .
antigravity-proxy

Keep the Antigravity CLI/service running and listening at the configured local URL. The defaults are ANTIGRAVITY_LOCAL_URL=http://127.0.0.1:8901/v1 and PROXY_PORT=8000. To change them, edit .env before starting the proxy. For a local development run instead of installing, use python main.py.

Test the proxy:

curl http://127.0.0.1:8000/health
curl http://127.0.0.1:8000/v1/models
curl -N http://127.0.0.1:8000/v1/chat/completions \
  -H 'Content-Type: application/json' \
  -d '{"model":"YOUR_MODEL","messages":[{"role":"user","content":"Hello"}],"stream":true}'

/health checks the upstream /v1/models endpoint and returns HTTP 200 on success or 503 if the listener is unavailable or returns an error. The proxy deliberately removes incoming Authorization headers; use Antigravity's own signed-in listener.

Build and upload to PyPI from Termux

PyPI does not accept a project-source ZIP as a Twine upload. Twine uploads the source distribution and wheel built from this project. From the unzipped project directory:

python -m pip install --upgrade build twine
python -m build
python -m twine upload dist/*

Twine will prompt for credentials. For a PyPI API token, enter __token__ as the username and the complete token (including the pypi- prefix) as the password. Create the project/token on PyPI first. The name antigravity-proxy must be available on PyPI; if it is already taken, change project.name in pyproject.toml to an available name and rebuild before uploading.