JAX-RS - HttpHeaders Examples

    @GET
    @Path("test1")
    public String allHeaders(@Context  HttpHeaders headers) {
        MultivaluedMap<String, String> rh = headers.getRequestHeaders();
        String str = rh.entrySet()
                       .stream()
                       .map(e -> e.getKey() + " = " + e.getValue())
                       .collect(Collectors.joining("<br/>"));

        return str;
    }
    @GET
    @Path("test2")
    public String acceptableLanguages(@Context HttpHeaders headers) {
        List<Locale> locales = headers.getAcceptableLanguages();
        return locales.stream()
                      .map(l -> l.toString())
                      .collect(Collectors.joining("<br/>"));
    }

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MultivaluedMap;
import java.util.List;
import java.util.Map;

@Path("/users")
public class UserResource {
    @Context
    private HttpHeaders httpHeaders;

    @GET
    public String getUsers() {
        System.out.println("In getUsers() method");
        printHeaderInfo();
        return "returning dummy user list";
    }

    private void printHeaderInfo() {
        System.out.println("---------------");
        MultivaluedMap<String, String> requestHeaders = httpHeaders.getRequestHeaders();
        for (Map.Entry<String, List<String>> entry : requestHeaders.entrySet()) {
            System.out.println(entry.getKey() + "=" + entry.getValue());
        }
    }
}