text: from fastapi import FastAPI
  from fastapi.middleware.wsgi import WSGIMiddleware
  from flask import Flask, escape, request
  
  flask_app = Flask(__name__)
  
  
  @flask_app.route("/")
  def flask_main():
      name = request.args.get("name", "World")
      return f"Hello, {escape(name)} from Flask!"
  
  
  app = FastAPI()
  
  
  @app.get("/v2")
  def read_main():
      return {"message": "Hello World"}
  
  
  app.mount("/v1", WSGIMiddleware(flask_app))