falcon-template.py

import falcon
import waitress
import json


class HelloWorldResource:
    def on_post(self, req, resp):
        content = req.stream.read().decode()
        if content == 'spam':
            resp.body = json.dumps('eggs')
        elif content == 'foo':
            resp.body = json.dumps('bar')
        else:
            resp.status = falcon.HTTP_404


if __name__ == '__main__':
    api = falcon.API()
    api.add_route('/helloworld', HelloWorldResource())
    waitress.serve(api, host="0.0.0.0", port=8080, threads=4)

Run this script and then try hitting the API with:

curl -X POST http://localhost:8080/helloworld -d spam