Flask at first run: Do not use the development server in a production environment

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For deploying an application to production, one option is to use Waitress, a production WSGI server.

Here is an example of using waitress in the code.

from flask import Flask

app = Flask(__name__)

@app.route("/")
def index():
    return "<h1>Hello!</h1>"

if __name__ == "__main__":
    from waitress import serve
    serve(app, host="0.0.0.0", port=8080)

Running the application:

$ python hello.py

Waitress also provides a command line utility waitress-serve. To use that, you can modify the code to the following:

from flask import Flask

app = Flask(__name__)

@app.route("/")
def index():
    return "<h1>Hello!</h1>"

def create_app():
   return app

Then we can use waitress-serve as the following:

waitress-serve --port=8080 --call hello:create_app

And BTW, 8080 is the default port.

To validate the deployment, open a separate window:

% curl localhost:8080
<h1>Hello!</h1>%

Or directly in your browser http://localhost:8080/.

Other alternatives to deploy your app include Gunicorn and uWSGI. For more details, please refer to the flask deploy doc.

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