How to read header parameters in JAX-RS restful web services?

package com.java2novice.restful;

import java.util.Set;

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.Response;

@Path("/http-header")
public class HttpHeaderService {

	@GET
	@Path("query")
	public Response queryHeaderInfo(@Context HttpHeaders httpHeaders){
		
		/** how to get specific header info? **/
		String cacheControl = httpHeaders.getRequestHeader("Cache-Control").get(0);
		System.out.println("Cache-Control: "+cacheControl);
		/** get list of all header parameters from request **/
		Set<String> headerKeys = httpHeaders.getRequestHeaders().keySet();
		for(String header:headerKeys){
			System.out.println(header+":"+httpHeaders.getRequestHeader(header).get(0));
		}
		return Response.status(200).entity("successfully queried header info").build();
	} 
}

Cache-Control: max-age=0
[stdout] (http--127.0.0.1-8080-1) host:localhost:8080
[stdout] (http--127.0.0.1-8080-1) connection:keep-alive
[stdout] (http--127.0.0.1-8080-1) cache-control:max-age=0
[stdout] (http--127.0.0.1-8080-1) accept:text/html,application/xhtml+xml,application/xml;q=0.9,
						image/webp,*/*;q=0.8
[stdout] (http--127.0.0.1-8080-1) user-agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 
						(KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36
[stdout] (http--127.0.0.1-8080-1) accept-encoding:gzip,deflate,sdch
[stdout] (http--127.0.0.1-8080-1) accept-language:en-US,en;q=0.8
[stdout] (http--127.0.0.1-8080-1) cookie:__atuvc=24%7C23%2C0%7C24%2C3%7C25%2C45%7C26%2C41%7C27; 
						bsau=14136427273262128776