title: Add header param with Resteasy client
body: <p>I using Resteasy to call my back</p>
  
  <p>So I use a interface to configure my call</p>
  
  <pre><code>@Path("/api/private/configuracao")
  public interface ConfiguracaoClient {
      @GET
      @Path("/")
      @Consumes("application/json")
      @HeaderParam(value = "db_teste")
      public ConfiguracaoVO findConfiguracao();
  }
  </code></pre>
  
  <p>and call like this:</p>
  
  <pre><code>public class ConfiguracaoClientImpl {
      ResteasyClient client;
      ConfiguracaoClient configuracaoClient;
      public ConfiguracaoClientImpl() {
          client = new ResteasyClientBuilder().build();
          ResteasyWebTarget target = client.target("http://localhost:8181/");
          target.request().header("public","db_teste");
          configuracaoClient = target.proxy(ConfiguracaoClient.class);
  
      }
  
      public ConfiguracaoVO findConfiguracao(){
          return configuracaoClient.findConfiguracao();
      }
  }
  </code></pre>
  
  <p>how can I add a parameter in header? 
  tks</p>