Request context in Flask - Mini Project: Build & Apply

Understanding Flask Request Context

📖 Scenario: You are building a simple Flask web app that greets users by their name passed in the URL. You will learn how Flask's request context works to access URL parameters.

🎯 Goal: Create a Flask app that reads a name parameter from the URL and returns a greeting message using Flask's request context.

📋 What You'll Learn

Create a Flask app instance

Use Flask's request object to get URL parameters

Define a route that accepts a name parameter

Return a greeting message including the name

💡 Why This Matters

🌍 Real World

Web apps often need to read user input from URLs to customize responses, like greeting users by name or filtering data.

💼 Career

Understanding request context is essential for backend web development with Flask, a popular Python web framework.

1

Set up Flask app and import request

Import Flask and request from flask. Create a Flask app instance called app.

Flask

from flask import Flask, request

# Create Flask app instance called app
# Your code here

Need a hint?

Use from flask import Flask, request and then app = Flask(__name__).

2

Define a route to accept a name parameter

Use the @app.route decorator to define a route /greet that accepts GET requests. Define a function called greet to handle this route.

Flask

from flask import Flask, request

app = Flask(__name__)

# Define route /greet with GET method
# Your code here

Need a hint?

Use @app.route('/greet', methods=['GET']) and define def greet():.

3

Access the name parameter from the request

Inside the greet function, use request.args.get('name') to get the name parameter from the URL query string. Store it in a variable called user_name.

Flask

from flask import Flask, request

app = Flask(__name__)

@app.route('/greet', methods=['GET'])
def greet():
    # Get 'name' parameter from URL query string
    # Your code here

Need a hint?

Use user_name = request.args.get('name') to get the name from the URL.

4

Return a greeting message using the name

Return a string greeting the user by name using an f-string: f"Hello, {user_name}!". This completes the Flask route function.

Flask

from flask import Flask, request

app = Flask(__name__)

@app.route('/greet', methods=['GET'])
def greet():
    user_name = request.args.get('name')
    # Return greeting message
    # Your code here

Need a hint?

Use return f"Hello, {user_name}!" to send the greeting back.