gistfile1.py

from gevent import monkey, sleep
from gevent.wsgi import WSGIServer
from flask import Flask, request
from random import random

monkey.patch_all()
app = Flask(__name__)

@app.route("/")
def index():

	result = []

	for i in xrange(5):
		sleep(random())
		result.append(request.args.get('foo'))

	return ', '.join(result) + '\n'

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