import json
import os

def application(environ, start_response):
    uid = os.geteuid()
    gid = os.getegid()

    out = json.dumps({
        'UID': uid,
        'GID': gid,
    }).encode('utf-8')

    start_response('200 OK', [
        ('Content-Length', str(len(out))),
        ('Content-Type', 'application/json')
    ])

    return [out]