What are some examples of middleware in Flask?

What are some examples of middleware in Flask?

Flask middleware is a way to process requests globally before they reach your view functions. Examples include authentication, logging, and CORS handling.

Can you give me a specific example of a logging middleware?

Sure! You can create a logging middleware by defining a function that logs request details before passing the request to the next middleware or view. Here's a simple example:

from flask import Flask, request
import logging

app = Flask(__name__)

logging.basicConfig(level=logging.INFO)

@app.before_request
def log_request():
    logging.info(f'Request: {request.method} {request.url}')

What about authentication middleware?

For authentication, you can create middleware that checks if a user is logged in before allowing access to certain routes. Here's a basic example:

from flask import Flask, redirect, url_for, session

app = Flask(__name__)
app.secret_key = 'your_secret_key'

@app.before_request
def require_login():
    if 'user_id' not in session and request.endpoint != 'login':
        return redirect(url_for('login'))

Are there any built-in middleware options in Flask?

Flask itself doesn't come with built-in middleware, but you can use extensions like Flask-CORS for handling CORS or Flask-Login for user session management.