code: def request_post(app, url, body, content_type=None):
      # TODO body and content type
      resp = {}
  
      def start_resp(status, _headers):
          resp["status"] = status
  
      resp["body"] = app(
          _request_env("POST", url, body, content_type), start_resp
      )
      return resp
  
imports: import io
  import json
  import logging
  import socket
  from werkzeug import routing
  from werkzeug import serving
  from werkzeug import exceptions
  from werkzeug.middleware.shared_data import SharedDataMiddleware
  from werkzeug.wrappers import Request, Response
label_desc: Use image node_id 10 for calling a global function with example usage: request_post(app, url, body, content_type) and returns: resp