# all duplicate headers and pick one.
            headers = {}
            headers['content-type'] = 'application/x-www-form-urlencoded'
            headers['authorization'] = urllib3.make_headers(
                basic_auth='%s:%s' % (self.cid, self.csec))['authorization']

            response = self._http.urlopen('POST', self.idp_ep,
                                          body="grant_type=client_credentials",

    sslSocket.startHandshake()
    return sslSocket
  }

  override fun onStream(stream: Http2Stream) {
    try {
      val requestHeaders = stream.takeHeaders()
      var path: String? = null
      var i = 0
      val size = requestHeaders.size
      while (i < size) {
        if (requestHeaders.name(i) == Header.TARGET_PATH_UTF8) {
          path = requestHeaders.value(i)

    stream!!.sink.close()
  }

  override fun readResponseHeaders(expectContinue: Boolean): Response.Builder? {
    val stream = stream ?: throw IOException("stream wasn't created")
    val headers = stream.takeHeaders(callerIsIdle = expectContinue)
    val responseBuilder = readHttp2HeadersList(headers, protocol)
    return if (expectContinue && responseBuilder.code == HTTP_CONTINUE) {
      null
    } else {
      responseBuilder