How to connect Python Flask CAS server to angular application?

I have the python server (Flask more precisely) up and running and it is connecting correctly to my CAS server, redirecting to CAS login, and returning correct user data upon login. This is relevant code from flask server:

app.secret_key = "SOMESECRETKEY"

cas_client = CASClient(
    version=3,
    service_url="http://localhost:5000/login?next=%2Fprofile",
    server_url='https://django-cas-ng-demo-server.herokuapp.com/cas/'

)

@app.route("/profile")
def profile(method=["GET"]):
    if "username" in session:
        jawt = jwt.encode(session["user_attributes"], app.secret_key, algorithm="HS256")
    return redirect("http://localhost:4200/?accessToken=" + jawt)

The data is returned to the angular page, via GET method redirect (see code above). I don't want to send the accessToken by GET method, but rather, I want to store it in localStorage. How can I do that, from python, but WITHOUT first sending it as GET parameter?

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