WSGI concept overview in Flask - Mini Project: Build & Apply

WSGI Concept Overview with Flask

📖 Scenario: You are creating a simple web application using Flask to understand how WSGI works as the bridge between your Python code and the web server.

🎯 Goal: Build a minimal Flask app that shows how WSGI handles requests and responses by setting up the app, configuring a route, and running the server.

📋 What You'll Learn

Create a Flask app instance named app

Define a route / that returns the text 'Hello, WSGI!'

Run the Flask app with debug mode enabled

💡 Why This Matters

🌍 Real World

Web developers use Flask and WSGI to build and serve Python web applications that respond to user requests.

💼 Career

Understanding WSGI and Flask basics is essential for backend developers working with Python web frameworks.

1

Create the Flask app instance

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

Flask

# Your code here

Need a hint?

Use Flask(__name__) to create the app instance.

2

Add a route for the home page

Use the @app.route('/') decorator to define a function called home that returns the string 'Hello, WSGI!'.

Flask

from flask import Flask
app = Flask(__name__)

# Your code here

Need a hint?

Define a function named home decorated with @app.route('/').

3

Configure the app to run with debug mode

Add the code to run the Flask app by calling app.run(debug=True) inside a if __name__ == '__main__': block.

Flask

from flask import Flask
app = Flask(__name__)

@app.route('/')
def home():
    return 'Hello, WSGI!'

# Your code here

Need a hint?

Use the standard Python entry point check to run the app with debug mode.

4

Understand WSGI role in the Flask app

Add a comment explaining that Flask uses WSGI to communicate between the web server and the Python app.

Flask

from flask import Flask
app = Flask(__name__)

@app.route('/')
def home():
    return 'Hello, WSGI!'

if __name__ == '__main__':
    app.run(debug=True)

# Your code here

Need a hint?

Write a comment starting with # Flask uses WSGI.