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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]