소켓통신의 이해

http://mobigen.tistory.com/26

소켓통신 (TCP/IP와 UDP 비교)

http://blog.naver.com/cache798/130004442830

URLConnection API

http://download.oracle.com/javase/6/docs/api/java/net/URLConnection.html

HttpURLConnection API

http://download.oracle.com/javase/6/docs/api/java/net/HttpURLConnection.html

HttpClient Tutorial

http://hc.apache.org/httpcomponents-client-ga/tutorial/html/index.html

HttpClient 사용 가이드

http://mainia.tistory.com/569

Http Header 분석

http://blog.naver.com/cache798/130007255447