How can I use a return value in a flask endpoint from another flask endpoint?

I am currently working with flask endpoints that are connected to my react frontend. My return value for val is "null". Return data is 100% correct as it appears in my server log.

How can I get the return value to be the value of data? I would appreciate a answer and also feedback on the overall code on how to make it better.

@app.route("/handyman", methods=["POST"])
def get_data():

    if request.method == "POST":
        data = request.form.get("url")
        print(data)
        return data
    
@app.route("/response")
def response():
    try:
        val = get_data()
        return {
            "sucess": val
        }
    except Exception as e:
        print(f"exception", e)

Below is my entire code part for context. Here the error is:

TypeError: path should be path-like or io.BytesIO, not <class 'NoneType'>

@app.route("/handyman", methods=["POST"])
def get_data():

    if request.method == "POST":
        data = request.form.get("url")
        print(data)
        return data

def model():

    val = get_data()
    img = load_img(val, target_size=(150, 150 ))
    img_array= img_to_array(img)
    img_array = np.expand_dims(img_array, axis=0)

    prediction = loaded_model.predict(img_array)[0]
    print(prediction)
    return prediction

def calculation():
    prediction = model()
    results = []

    x1 = prediction[0]
    x2 = prediction[1]

    if x1 > 0.5:
        result = "Händler"
        results.append(result)
    if x2 > 0.5:
        result = "Baustelle"
        results.append(result)

    return results

@app.route("/response")
def response():
    model()
    result = calculation()
    return {
        "success": result[-1]
    }