How to Send a Message to OpenStack Zaqar with JAX-RS

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedHashMap;
import javax.ws.rs.core.MultivaluedMap;

@SuppressWarnings("serial")
@WebServlet(name = "SampleZaqarServlet", value = "/")
public final class SampleZaqarServlet extends HttpServlet {

  @Override
  protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) {
    final Client client = ClientBuilder.newClient();

    final MultivaluedMap<String, String> headers = new MultivaluedHashMap<>();

    headers.putSingle("Client-ID", ...);

    headers.putSingle("X-Auth-Token", ...);

    headers.putSingle("X-Project-Id", ...);

    client.target("http://host:8888/v1.1/queues/SampleQueue/messages").request(MediaType.APPLICATION_JSON_TYPE).headers(headers).post(Entity.json("{\"messages\":[{\"body\":\"Simples Assim\"}]}"));

    client.close();
  }
 
}

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