GitHub milestone query returns open milestones even when I request closed ones.

gistfile1.txt

milestoneNumbers = {}

for state in ['open', 'closed']:
    print("***" + state)
    stateJSON = {'state' : state}
    print(json.dumps(stateJSON))
    response = requests.get(
        'https://api.github.com/repos/' + username + '/' + repo + '/milestones',
        data=json.dumps(stateJSON),
        auth=(username, password))

    milestones = response.json()
    for milestone in milestones:
        print(milestone['title'] + " " + str(milestone['number']))
        milestoneNumbers[milestone['title']] = milestone['number']

print(milestoneNumbers)