code: def test_replace(self):
      environ1 = {"one": "two", "three": "four"}
      auth1 = auth_lib.AuthContext({}, environ1)
      environ2 = {"one": "two"}
      auth2 = auth_lib.AuthContext({}, environ2)
      remote_ip1 = ipaddress.ip_address("192.168.0.1")
      remote_ip2 = ipaddress.ip_address("192.168.0.2")
      x_forwarded_for_ips1 = (remote_ip1, REMOTE_IP)
      x_forwarded_for_ips2 = (remote_ip2, REMOTE_IP)
      client_feature_flags1 = {"oneFlag": True}
      client_feature_flags2 = {"twoFlag": False}
  
      req_context = context.RequestContext(
          auth=auth1,
          remote_ip=remote_ip1,
          x_forwarded_for=x_forwarded_for_ips1,
          client_feature_flags=client_feature_flags1,
      )
      self.assertEqual(req_context.auth, auth1)
      self.assertEqual(req_context.remote_ip, remote_ip1)
      self.assertEqual(
          req_context.x_forwarded_for, x_forwarded_for_ips1
      )
      self.assertEqual(
          req_context.client_feature_flags, client_feature_flags1
      )
  
      req_context_new = req_context.replace(auth=auth2)
      self.assertEqual(req_context_new.auth, auth2)
      self.assertEqual(req_context_new.remote_ip, req_context.remote_ip)
      self.assertEqual(
          req_context_new.x_forwarded_for, req_context.x_forwarded_for
      )
      self.assertEqual(
          req_context_new.client_feature_flags,
          req_context.client_feature_flags,
      )
  
      req_context_new = req_context.replace(remote_ip=remote_ip2)
      self.assertEqual(req_context_new.auth, req_context.auth)
      self.assertEqual(req_context_new.remote_ip, remote_ip2)
      self.assertEqual(
          req_context_new.x_forwarded_for, req_context.x_forwarded_for
      )
      self.assertEqual(
          req_context_new.client_feature_flags,
          req_context.client_feature_flags,
      )
  
      req_context_new = req_context.replace(
          x_forwarded_for=x_forwarded_for_ips2
      )
      self.assertEqual(req_context_new.auth, req_context.auth)
      self.assertEqual(req_context_new.remote_ip, req_context.remote_ip)
      self.assertEqual(
          req_context_new.x_forwarded_for, x_forwarded_for_ips2
      )
      self.assertEqual(
          req_context_new.client_feature_flags,
          req_context.client_feature_flags,
      )
  
      req_context_new = req_context.replace(
          client_feature_flags=client_feature_flags2
      )
      self.assertEqual(req_context_new.auth, req_context.auth)
      self.assertEqual(req_context_new.remote_ip, req_context.remote_ip)
      self.assertEqual(
          req_context_new.x_forwarded_for, req_context.x_forwarded_for
      )
      self.assertEqual(
          req_context_new.client_feature_flags, client_feature_flags2
      )
  
file_path: tensorboard/tensorboard/context_test.py
imports: import ipaddress
  from tensorboard import auth
  from tensorboard import context
  from tensorboard import test
label_desc: Use image node_id 4 for calling the RequestContextTest obj's underlying member method code with example usage: obj.test_replace() without return types