I have build a very very simple server to learn Flask and Jupiter and see How I made work them togheter:

`#%% ALL server logic
from flask import Flask,jsonify,request,make_response

app = Flask(__name__)

@app.route('/')
def nakedRoute():
    print('inside the teapot')
    return "I'm a teapot", 418

@app.route('/echo/', methods=['POST'])  
def serverAPI_ejemplo():
    try:
        if not request.is_json:
            return make_response(jsonify({"error": "I was expecting a JSON"}), 400)

        data = request.json['key'] + 1

        return jsonify({"key":data}), 200  # Código de estado 200 (OK)

    except Exception as e:
        return make_response(jsonify({"error": 33}), 500)
    

#%% Mount the server
if __name__ == "__main__":
    app.run(port=5000, debug=True)


# %% TEST naked router
with app.app_context():
    result= nakedRoute()
    print(result)


# %% TEST /echo/ for error 500
with app.app_context():
    result= serverAPI_ejemplo()
    print(result)

In that sense, I can load all the funcionality in Jupiter within the first cell, and play with the code in real time

Well, all this work as soon as I expect to add a Json to the CALL

# %% TEST /echo/ for a JSON
with app.app_context():
    my_JSON = {"key":33}
    #...???
    result= serverAPI_ejemplo()
    print(result)`

so far, I have not been able to complete the code to be able to call serverAPI_ejemplo, and get the JSON pas trough