code: def add_header(response):
      response.headers["Cache-Control"] = "no-store"
      return response
  
imports: import json
  import os
  import webbrowser
  from functools import wraps
  import time
  from sys import stderr
  import itertools
  from markdown import markdown
  from flask import Flask, url_for, render_template, jsonify, request, make_response
  import webview
  from .None import app
  from parsr_client import ParsrClient
label_desc: Use image node_id 2 for calling a global function with example usage: add_header(response) and returns: response