Redirect and abort functions in Flask - Mini Project: Build & Apply

Using Redirect and Abort Functions in Flask

📖 Scenario: You are building a simple Flask web app that handles user requests. Sometimes you want to send users to a different page, and sometimes you want to stop the request with an error.

🎯 Goal: Build a Flask app with routes that use redirect to send users to another page and abort to stop requests with an error code.

📋 What You'll Learn

Create a Flask app instance named app

Create a route /home that returns the text 'Welcome Home!'

Create a route /go-home that redirects to /home using redirect and url_for

Create a route /secret that aborts with a 403 Forbidden error using abort

💡 Why This Matters

🌍 Real World

Redirects help guide users to the right pages, like after login. Abort stops unauthorized access with proper error codes.

💼 Career

Understanding redirect and abort is essential for web developers to control user flow and handle errors gracefully in web apps.

1

Set up Flask app and home route

Import Flask from flask and create a Flask app instance called app. Then create a route /home that returns the string 'Welcome Home!'.

Flask

from flask import Flask

app = Flask(__name__)

# Create a route '/home' that returns 'Welcome Home!'
# Your code here

Need a hint?

Use @app.route('/home') to create the route and define a function home that returns the welcome text.

2

Import redirect and url_for

Import redirect and url_for from flask to prepare for redirecting users.

Flask

from flask import Flask, redirect, url_for

app = Flask(__name__)

@app.route('/home')
def home():
    return 'Welcome Home!'

# Your code here

Need a hint?

Add redirect and url_for to the import statement from flask.

3

Create a redirect route

Create a route /go-home that uses redirect and url_for to send the user to the /home route.

Flask

from flask import Flask, redirect, url_for

app = Flask(__name__)

@app.route('/home')
def home():
    return 'Welcome Home!'

# Create a route '/go-home' that redirects to '/home'
# Your code here

Need a hint?

Use @app.route('/go-home') and define go_home that returns redirect(url_for('home')).

4

Create a route that aborts with 403 error

Import abort from flask. Then create a route /secret that aborts the request with a 403 Forbidden error using abort(403).

Flask

from flask import Flask, redirect, url_for, abort

app = Flask(__name__)

@app.route('/home')
def home():
    return 'Welcome Home!'

@app.route('/go-home')
def go_home():
    return redirect(url_for('home'))

# Create a route '/secret' that aborts with 403 error
# Your code here

Need a hint?

Import abort and create a route /secret that calls abort(403) inside its function.