포탈 모음

http://thesoul214.blogspot.kr/2013/07/http-request-response-html-jsp.html

Java Map 관련

Java HashMap 내부 구현

https://stackoverflow.com/questions/16257761/difference-between-red-black-trees-and-avl-trees

https://stackoverflow.com/questions/2889777/difference-between-hashmap-linkedhashmap-and-treemap

https://stackoverflow.com/questions/26311776/why-iteration-through-buckets-in-linkedhashmap-is-faster-than-hashmap

SynchronizedMap과 ConcurrentHashMap

http://www.jitendrazaa.com/blog/java/complete-java-collection-tutorial-for-the-beginner/

https://www.quora.com/What-is-the-role-of-OSI-layers-when-we-open-a-webpage

https://www.netmanias.com/ko/post/blog/5353/dns/dns-basic-operation

RESTful

http://sonim1.tistory.com/105

http://blog.remotty.com/blog/2014/01/28/lets-study-rest/

https://www.javacodegeeks.com/2014/04/java-interview-questions-answers.html