code: def testResponseCharsetTranscoding(self):
      bean = "要依法治国是赞美那些谁是公义的和惩罚恶人。 - 韩非"
  
      # input is unicode string, output is gbk string
      q = wrappers.Request(wtest.EnvironBuilder().get_environ())
      r = http_util.Respond(q, bean, "text/plain; charset=gbk")
      self.assertEqual(r.response, [bean.encode("gbk")])
  
      # input is utf-8 string, output is gbk string
      q = wrappers.Request(wtest.EnvironBuilder().get_environ())
      r = http_util.Respond(
          q, bean.encode("utf-8"), "text/plain; charset=gbk"
      )
      self.assertEqual(r.response, [bean.encode("gbk")])
  
      # input is object with unicode strings, output is gbk json
      q = wrappers.Request(wtest.EnvironBuilder().get_environ())
      r = http_util.Respond(
          q, {"red": bean}, "application/json; charset=gbk"
      )
      self.assertEqual(
          r.response, [b'{"red": "' + bean.encode("gbk") + b'"}']
      )
  
      # input is object with utf-8 strings, output is gbk json
      q = wrappers.Request(wtest.EnvironBuilder().get_environ())
      r = http_util.Respond(
          q,
          {"red": bean.encode("utf-8")},
          "application/json; charset=gbk",
      )
      self.assertEqual(
          r.response, [b'{"red": "' + bean.encode("gbk") + b'"}']
      )
  
      # input is object with gbk strings, output is gbk json
      q = wrappers.Request(wtest.EnvironBuilder().get_environ())
      r = http_util.Respond(
          q,
          {"red": bean.encode("gbk")},
          "application/json; charset=gbk",
          encoding="gbk",
      )
      self.assertEqual(
          r.response, [b'{"red": "' + bean.encode("gbk") + b'"}']
      )
  
imports: import gzip
  import io
  import struct
  from unittest import mock
  from werkzeug import test
  from werkzeug import wrappers
  from tensorboard import test
  from tensorboard.backend import http_util
label_desc: Use image node_id 5 for calling the RespondTest obj's underlying member method code with example usage: obj.testResponseCharsetTranscoding() without return types