Handling 404 Errors in Flask

In Flask, handling 404 errors is straightforward and helps improve user experience by providing a custom error page.

Here’s a quick guide to setting it up.

Step 1: Create a Custom 404 Error Handler

Define a custom error handler for 404 errors in your Flask application:

Python
from flask import Flask, render_template

app = Flask(__name__)

@app.errorhandler(404)
def page_not_found(e):
    return render_template('404.html'), 404
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Step 2: Create a 404 HTML Page

Create a 404.html file in the templates directory of your Flask project with your custom message:

HTML
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Page Not Found</title>
</head>
<body>
    <h1>404 - Page Not Found</h1>
    <p>Sorry, the page you are looking for does not exist.</p>
</body>
</html>
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Conclusion

By setting up a custom 404 error page in Flask, you can provide a better user experience and guide users back to your application’s main sections.

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