class_docstr: Tests the default Werkzeug implementation of TensorBoardServer.
  
  Mostly useful for IPv4/IPv6 testing. This test should run with only
  IPv4, only IPv6, and both IPv4 and IPv6 enabled.
code: def testMakeServerBlankHost(self):
      # Test that we can bind to all interfaces without throwing an error
      server = program.WerkzeugServer(
          self._StubApplication(),
          self.make_flags(port=0, path_prefix=""),
      )
      self.assertStartsWith(server.get_url(), "http://")
  
imports: import argparse
  import io
  import sys
  from unittest import mock
  from tensorboard import program
  from tensorboard import test
  from tensorboard.plugins import base_plugin
  from tensorboard.plugins.core import core_plugin
label_desc: Use image node_id 2 for calling the WerkzeugServerTest obj's underlying member method code with example usage: obj.testMakeServerBlankHost() without return types