Comment 9 for bug 1843932

It is a hello-kitty app issue.

Liveness/Readiness probe is done with a http get to an app running inside container.
The app listens on ipv4.

app.py:
  app.run(host='0.0.0.0', port=80)

Changing to listen to ipv4 and ipv6 gives HTTP Error 500:
  app.run(host='::', port=80)

Probes pass only if HTTP 2xx to 4xx are returned.

Changing the whole app.py passes the probes:
from flask import Flask
import os
import socket

app = Flask(__name__)

@app.route("/")
def hello():
    html = "<h3>Hello Kitty {name}!</h3>"
    return html

if __name__ == "__main__":
    app.run(host='0.0.0.0', port=80)