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How to start a flask server on android/iOS in backend

I am making an app with flutter frontend and python backend. The problem is that I need to create a flask server running offline locally on an Android or iOS device. I don't know how to start the server simultaneously with the app to push some http requests to the server.

The server is basically:

from flask import Flask, request, jsonify
import socket
import threading
import paramiko

app = Flask(__name__)

@app.route('/function_name', methods=['POST'])
def function():

....

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000)


source https://stackoverflow.com/questions/76086999/how-to-start-a-flask-server-on-android-ios-in-backend
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