code: def testAcceptGzip_alreadyCompressed_sendsPrecompressedResponse(self):
      gzip_text = _gzip(b"hello hello hello world")
      e = wtest.EnvironBuilder(
          headers={"Accept-Encoding": "gzip"}
      ).get_environ()
      q = wrappers.Request(e)
      r = http_util.Respond(
          q, gzip_text, "text/plain", content_encoding="gzip"
      )
      self.assertEqual(r.response, [gzip_text])
  
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 7 for calling the RespondTest obj's underlying member method code with example usage: obj.testAcceptGzip_alreadyCompressed_sendsPrecompressedResponse() without return types