import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;


class Main
{
	public static void main(String[] args) {
		Client client = Client.create();

		WebResource webResource = client
				.resource("http://localhost:8080/RESTfulExample/rest/json/metallica/get");

		ClientResponse response = webResource.accept("application/json")
				.get(ClientResponse.class);

	}

}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.client.RestTemplate;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.cloud.client.ServiceInstance;
import java.net.URI;

class Main
{
    @Autowired
    private LoadBalancerClient loadBalancerClient;

    void f()
	{
		RestTemplate client ;
        ServiceInstance serviceInstance = loadBalancerClient.choose("user-auth");
        String path = serviceInstance.getUri().toString() + "/oauth/token";
        client.put(path, client);
	}
}

interface GitHub {
  @RequestLine("GET /repos/{owner}/{repo}/contributors")
  List<Contributor> contributors(@Param("owner") String owner, @Param("repo") String repo);
}
 
public static class Contributor {
  String login;
  int contributions;
}
 
public class MyApp {
  public static void main(String... args) {
    GitHub github = Feign.builder()
                         .decoder(new GsonDecoder())
                         .target(GitHub.class, "https://api.github.com");
   
    // Fetch and print a list of the contributors to this library.
    List<Contributor> contributors = github.contributors("OpenFeign", "feign");
    for (Contributor contributor : contributors) {
      System.out.println(contributor.login + " (" + contributor.contributions + ")");
    }
  }
}

import java.util.List;
 
@FeignClient(
        name = "${client.name}",
        path= "${client.path}",
        configuration = FeignConfiguration.class
)
public interface ClientConfiguration {
 
    @RequestMapping(method = RequestMethod.POST, value = "/services/clients")
    List<SupplierTransitionDTO> getData(@RequestBody List<String> codes) throws FeignException;
}

@FeignClient(name = "Client", url = "${build.api.url}", path = "/api/v1")
public interface ClientConfiguration {

    @GetMapping("/sites/{site-id}/clients")
    ConsentResponse getConfiguration(
            @PathVariable("site-id") String siteId,
            @RequestParam("types") List<ConfigType> types);
}

import retrofit2.http.GET;

public interface ExampleGetService {
    @GET("getservice.example")
    Single<ExampleApi> getMode();
}

class MyHttpCall
{
   void execute(String url, String method)
   {
      Client client = ClientBuilder.newClient();
      WebTarget myResource = client.target(url);

      if (method == "GET")
      {
          String response = myResource.request(MediaType.TEXT_PLAIN).get(String.class);
      }
      else if (method == "PUT")
      {
          myResource.request(MediaType.TEXT_PLAIN).put(null);
      }
         
   }

}