gistfile1.py

from gevent import monkey, sleep
from gevent.pywsgi import WSGIServer
from flask import Flask

monkey.patch_all()
app = Flask(__name__)

@app.route("/")
def hello():
	print 'request'
	sleep(10)
	return 'response'

if __name__ == "__main__":
	http_server = WSGIServer(('',5000), app)
	http_server.serve_forever()