URL vs URI
http://stackoverflow.com/questions/176264/whats-the-difference-between-a-uri-and-a-url

Reading directly from a URL http://docs.oracle.com/javase/tutorial/networking/urls/readingURL.html

Apache HTTP Client https://hc.apache.org/httpcomponents-client-4.4.x/tutorial/html/index.html

Apache HTTP Client Examples
https://hc.apache.org/httpcomponents-client-4.4.x/examples.html

REST http://en.wikipedia.org/wiki/Representational_state_transfer, http://www.looah.com/source/view/2284