8. Redirects and Errors¶
To redirect a user to another endpoint, use the
function; to abort a request early with an error code, use the
from flask import abort, redirect, url_for @app.route('/') def index(): return redirect(url_for('login')) @app.route('/login') def login(): abort(401) this_is_never_executed()
This is a rather pointless example because a user will be redirected from the index to a page they cannot access (401 means access denied) but it shows how that works.
By default a black and white error page is shown for each error code. If
you want to customize the error page, you can use the
from flask import render_template @app.errorhandler(404) def page_not_found(error): return render_template('page_not_found.html'), 404
404 after the
render_template() call. This
tells Flask that the status code of that page should be 404 which means
not found. By default 200 is assumed which translates to: all went well.
See Error handlers for more details.