Flask is a Python web framework and Gunicorn is a Python Web Server Gateway Interface (WSGI) HTTP server.
Setup
Install the requirements:
$ pip3 install flask gunicorn
Create an exampleproject.py:
import random
from flask import Flask
app = Flask(__name__)
random.seed(0)
@app.route("/")
def hello():
x = random.randint(1, 100)
y = random.randint(1, 100)
return str(x * y)
if __name__ == "__main__":
app.run(host="0.0.0.0")
and an wsgi.py:
from exampleproject import app
if __name__ == "__main__":
app.run()
Run it with
$ gunicorn --bind 0.0.0.0:5000 wsgi:app
Benchmarking it
I want to see when this fails. So I test it with ApacheBench (ab):
$ sudo apt-get install apache2-utils
And then run 50 000 requests with different concurrency.
Seen Errors
Connection reset by peer (104)
I got a lot of apr_socket_recv: Connection reset by peer (104) with
gunicorn.