Dockerfile

FROM python:3


RUN wget https://gist.githubusercontent.com/patrick-east/24938c63f373e40c7b5832841605b1b2/raw/ca6370c91c255cec91ac9d21a7252f5c6ffdc35d/postr-server.py
RUN mv postr-server.py /bin/postr-server.py
RUN chmod +x /bin/postr-server.py

RUN pip install flask argparse

postr-server.py

#!/usr/bin/env python

import argparse
from flask import abort, Flask, request, send_from_directory
import os
import json
import gzip

app = Flask(__name__)

import logging
log = logging.getLogger('werkzeug')
log.setLevel(logging.ERROR)

@app.route('/<path:path>', methods=['POST'])
def handle_post(path):
    print(gzip.decompress(request.data).decode())
    return "{}"

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Run a server')
    parser.add_argument('--port', default=80, help='port to bind on')

    args = parser.parse_args()

    app.run(host='0.0.0.0', port=args.port)

requirements.txt

flask
argparse

Example to run the container:

docker build . -t opa-logger
docker run -p 8222:80 opa-logger postr-server.py

Which binds it to port 8222 on the local host (or plumb them together in docker however you would like)