code: def a_request():
      request = MagicMock()
      request.method = "post"
      request.url = "http://{}.com".format(a_string())
      request.headers = {a_string(): a_string()}
      request.body = a_string()
      return request
  
label_desc: Use image node_id 1 for calling a global function with example usage: a_request() and returns: request