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Flask/Werkzeug, how to return previous page after login

def logged_in(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if session.get('logged_in') is not None:
            return f(*args, **kwargs)
        else:
            flash('Please log in first...', 'error')
            next_url = get_current_url() # However you do this in Flask
            login_url = '%s?next=%s' % (url_for('login'), next_url)
            return redirect(login_url)
    return decorated_function

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Flask/Werkzeug, how to return previous page after login

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