WSGI servers (Gunicorn, uWSGI) in Flask - Mini Project: Build & Apply

Basic Flask App Setup for WSGI Servers

📖 Scenario: You want to create a simple Flask web app that can be run using WSGI servers like Gunicorn or uWSGI. This app will serve a basic homepage.

🎯 Goal: Build a minimal Flask application with a single route that returns a welcome message. This app will be ready to run on WSGI servers.

📋 What You'll Learn

Create a Flask app instance named app

Define a route / that returns the text "Welcome to WSGI server demo!"

Add a configuration variable DEBUG set to True

Include the if __name__ == '__main__' block to run the app locally

💡 Why This Matters

🌍 Real World

Flask apps are often deployed using WSGI servers like Gunicorn or uWSGI to handle multiple requests efficiently in production.

💼 Career

Understanding how to set up a Flask app for WSGI servers is essential for backend web development roles and deploying Python web applications.

1

Create the Flask app instance

Import Flask from flask and create a Flask app instance called app.

Flask

# Import Flask and create app instance
# Your code here

Need a hint?

Use Flask(__name__) to create the app instance.

2

Add a configuration variable

Set the configuration variable DEBUG to True on the app.config dictionary.

Flask

from flask import Flask
app = Flask(__name__)
# Set app.config['DEBUG'] to True
# Your code here

Need a hint?

Use app.config['DEBUG'] = True to enable debug mode.

3

Define the home route

Use the @app.route('/') decorator to define a function called home that returns the string "Welcome to WSGI server demo!".

Flask

from flask import Flask
app = Flask(__name__)
app.config['DEBUG'] = True

# Define home route with @app.route('/')
# Your code here

Need a hint?

Use the @app.route('/') decorator and define a function that returns the welcome message.

4

Add the run block for local testing

Add the if __name__ == '__main__' block to call app.run() so the app can run locally.

Flask

from flask import Flask
app = Flask(__name__)
app.config['DEBUG'] = True

@app.route('/')
def home():
    return "Welcome to WSGI server demo!"

# Add if __name__ == '__main__' block to run app
# Your code here

Need a hint?

This block allows running the app directly with python.