code: def create_large_payload(self):
      num_chars = 2 * 1024 * 1024  # 2MB Size
      large_string = string.printable * (
          num_chars // len(string.printable)
      )
      large_string += string.printable[
          : num_chars % len(string.printable)
      ]
      payload = {
          "data": {"_arg1": [1, large_string]},
          "script": "return _arg1",
      }
      return json.dumps(payload).encode("utf-8")
  
imports: import base64
  import json
  import os
  import tempfile
  import string
  from tornado.testing import AsyncHTTPTestCase
  from tabpy.tabpy_server.app.app import TabPyApp
  from tabpy.tabpy_server.handlers.util import hash_password
label_desc: Use image node_id 4 for calling the TestEvaluationPlaneHandlerMaxRequestSize obj's underlying member method code with example usage: obj.create_large_payload() and returns: json