Flask-login not redirecting to previous page

I have seen quite a few questions with this in mind, but haven't been able to address my issue. I have a Flask app with flask-login for session management. And, when I try to view a page without logging in, I get redirected to a link in form of /login/?next=%2Fsettings%2F

The issue is, as far as I could have it understand, that the "next" argument holds the part of the site I actually need, but when submitting a request to a login form, it is done via POST, so this argument is no longer available for me to redirect it to.

I tried using Request.path from Request (and url) but both just return the /login/ as the request url/path, not the actual /login/?next=xxx.

My login method is as follows:

@app.route('/login/', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        #getting the user
        user = User.get(request.form['username'])
        if user.user is None:
            return redirect('/login/')
        #actual login proces
        if user and check_password_hash(user.user.password, request.form['password']):
            login_user(user, remember=remember)
            #the redirection portion of the login process
            return redirect(request.path or ("/")) # I tried various options there but without success, like request.args['next'] and such

        return redirect('/login/')

    else:
        return redirect('/')

Thanks