code: def test_get_external_ip_html(self):
      # This tests the case where the external URL returns a web page.
      # https://github.com/streamlit/streamlit/issues/554#issuecomment-604847244
  
      response_text = """
          <html>
              ... stuff
          </html>
          """
  
      with requests_mock.mock() as m:
          m.get(net_util._AWS_CHECK_IP, text=response_text)
          self.assertEqual(None, net_util.get_external_ip())
  
      net_util._external_ip = None
  
file_path: streamlit/lib/tests/streamlit/net_util_test.py
imports: import unittest
  import requests
  import requests_mock
  from streamlit import net_util
label_desc: Use image node_id 5 for calling the UtilTest obj's underlying member method code with example usage: obj.test_get_external_ip_html() without return types