client =
      clientTestRule.newClientBuilder()
        .socketFactory(
          object : DelegatingSocketFactory(SocketFactory.getDefault()) {
            @Throws(IOException::class)
            override fun configureSocket(socket: Socket): Socket {
              socket.sendBufferSize = SOCKET_BUFFER_SIZE
              socket.receiveBufferSize = SOCKET_BUFFER_SIZE
              return socket
            }
          },
        )

    val trustManager = client.x509TrustManager!!

    val delegatingSocketFactory =
      object : DelegatingSSLSocketFactory(sslSocketFactory) {
        override fun configureSocket(sslSocket: SSLSocket): SSLSocket {
          return object : DelegatingSSLSocket(sslSocket) {
            override fun getApplicationProtocol(): String {
              throw UnsupportedOperationException()
            }