code: def test_missing_headers(self):
      file_owner = "get_test_user"
      file_id = 0
      resource = "/apigetfile/{0}/{1}/".format(file_owner, file_id)
      headers = list(default_headers.keys())
      for header in headers:
          hd = copy.copy(default_headers)
          del hd[header]
          response = requests.get(server + resource, headers=hd)
          content = _json.loads(
              response.content.decode("unicode_escape")
          )
          self.assertEqual(response.status_code, 422)
  
file_path: plotly.py/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_get_requests/test_get_requests.py
imports: import copy
  import requests
  import json
  from chart_studio.tests.utils import PlotlyTestCase
label_desc: Use image node_id 5 for calling the GetRequestsTest obj's underlying member method code with example usage: obj.test_missing_headers() without return types