Flask Tutorials: Redirects and Errors

Welcome to the Flask tutorial on Redirects and Errors! In this lesson, we'll explore how to handle redirects and errors in Flask web applications.

Redirects 🎯

A redirect is a response sent from a web server to a client (typically a web browser) to instruct it to move to a different web page or URL. In Flask, we can use the redirect() function to create redirects.

Redirecting to a new URL 💡

python

from flask import Flask, redirect

app = Flask(__name__)

@app.route('/')
def home():
    return redirect('/about')

@app.route('/about')
def about():
    return 'About page'

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

In the above example, when we access the root URL ('/'), the home() function returns a redirect to the /about URL.

Redirecting with a status code 📝

You can also redirect with a specific HTTP status code. For example, for a permanent redirect (301), you can use:

python

return redirect('/about', code=301)

Errors 📝

Errors are bound to happen in any web application. Flask provides a simple way to handle them using error handlers.

Custom Error Pages 🎯

You can create custom error pages for different types of errors. Here's how to create a custom error page for a 404 error:

python

from flask import Flask, abort, render_template

app = Flask(__name__)

@app.route('/<path:path>')
def catch_all(path):
    return f'Page not found: {path}'

@app.errorhandler(404)
def not_found_error(error):
    return render_template('404.html'), 404

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

In the above example, we catch all requests and return a custom message for any path that doesn't exist. Additionally, we create an error handler for the 404 error, which renders a template called 404.html with a status code of 404.

Flask Tutorials: Redirects and Errors

Flask Tutorials: Redirects and Errors

Redirects 🎯

Redirecting to a new URL 💡

Redirecting with a status code 📝

Errors 📝

Custom Error Pages 🎯

Quiz