flask session 在从 c# mvc Z2567A5EC93705EB7AC2CZ98 应用程序调用调用时不会持续存在

Question

I wrote a web service in python flask. In my code I have flask session object and it looks good.

Here is a short example how my python code look like-

@app.route('/api/simpleTry', methods=['GET'])
def api_simple():
    user_id = request.args['id']
    sentence = request.args['sentence']

    if 'user_id' not in session.keys():
        session['user_id'] = user_id
    return jsonify("hello")
app.run()

when I invoke the service through 'crome' explorer it works good, the session persist and when I 2 open 2 clients (1- crome, 2-incognito) I can see that each one of them has a separate session.

in addition, I have a C# mvc web application that act as my client and over there I call the python flask service I wrote.

address = "http://localhost:5000/api/simpleTry?id=" + userId + "&sentence=" + sentence;
using (var w = new WebClient())
{
     json_data = w.DownloadString(address);
     ...
}

The code works well. but , as opposed to 'crome', when sending the request from c#, the session in python does not persist and create a new session for each request.

I guess I should send something from C# to the service in order to use the existing session, but I don't what and how.

Answer 1

Flask sessions uses cookies to communicate session information between the client & server. When you used a browser, the browser is the client & automatically sends the cookies back to the server. When you use a C# client, I'm not sure if it does that for you automatically. You may have to read the session cookie from the header & send it along with subsequent requests.

From the Flask documentation : This is implemented on top of cookies for you and signs the cookies cryptographically