[ObsoleteApacheClient.java][obsolete_apache_client] into your project.

 *  **OkHttp now supports duplex calls over HTTP/2.** With normal HTTP calls the request must finish
    before the response starts. With duplex, request and response bodies are transmitted
    simultaneously. This can be used to implement interactive conversations within a single HTTP
    call.

    peer.play()

    // Play it back.
    val connection = connect(peer)
    connection.writePingAndAwaitPong()
    val stream = connection.newStream(headerEntries("a", "android"), true)
    // finish the stream
    stream.writeHeaders(headerEntries("b", "berserk"), true, false)
    assertFailsWith<IllegalStateException> {
      stream.enqueueTrailers(headersOf("trailers", "boom"))
    }
  }