Rest Web Services

• JAX-RS(Java API for RESTful Web Services) defined in JSR311. JAX-RS只是一套接口规范，位于javax.ws.rs. 包含了很多Java annotation的定义
• JAX-RS 具体实现由第三方提供，比如Sun的Jersy. 实现包含javax.ws.rs.*, 所以不用额外提供JAX-RS

Idempotence

Reportable or not.

• GET clearly is.
• DELETE is.
• PUT is. PUT /messages/42 update message 42
• POST is NOT.

Response Header: Content Type

• Directives
  • dedia-type: the MIME type of the resource or the data
  • charset
  • boundary

HATEOAS(Hypermedia as the Engine of Application State)

• REST dont have service definitions/documentations
• All you need to nevigate a REST API are within the response itself