Gunicorn experiment

gu.py

# to run: 
#   gunicorn --workers=3 --worker-class sync gu:app
#   gunicorn --workers=3 --worker-class gevent gu:app
#   etc.

import threading
import os


def app(environ, start_response):
    """Simplest possible application object"""
    print("current-tid: {0}. active-count: {1}. pid: {2}".format(
        threading.current_thread().ident,
        threading.active_count(),
        os.getpid(),
    ))
    data = 'Hello, World!\n'
    status = '200 OK'
    response_headers = [
        ('Content-type','text/plain'),
        ('Content-Length', str(len(data)))
    ]
    start_response(status, response_headers)
    return iter([data])