RESTFul WebApp Concept
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The document discusses the core concepts of REST including: 1) Resources are items that can be represented in different formats and accessed via URIs. 2) Clients interact with resources using standard HTTP methods like GET, POST, PUT, and DELETE. 3) RESTful web services use standard HTTP methods through a uniform interface and aim to be stateless.
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RESTFul WebApp Concept
- 1. Dian Wahyu Aditya [email_address] REST v 2.3
- 3. Core Concept
- 4. Web Service Demo Struts2
- 5. Spring MVC
- 7. REST? Representational State Transfer # Defined by Roy T. Fielding in his doctoral dissertation. (Co-founder of Apache HTTP Project) An Architectural Style
- 8. REST? Representational State Transfer #Use HTTP, URI, and other web standard correctly Web Used Correctly
- 10. REST: Core Concept “ Things are Resources” Resources can be items of information (a blog entry) or informational descriptions of real things (a blog author) RESOURCE
- 11. REST: Core Concept “ Resource Have URIs” Uniform Resource Identifier are unique ids for resources. RESOURCE U R I
- 12. REST: Core Concept “ Resources have Representation” Representations can have different formats (HTML, XML, JSON). RESOURCE U R I REPRESENTATION REPRESENTATION
- 13. REST: Core Concept “ Representations have URLs” Uniform Resource Locators describe how to get to a representation of a resource, they include protocol, hostname, path and extra information. RESOURCE U R I REPRESENTATION REPRESENTATION URL URL URL
- 14. REST: Core Concept “ Client interact via Verbs” RESOURCE U R I REPRESENTATION REPRESENTATION URL URL URL POST GET PUT DELETE
- 16. RESTFul Web Service “ Use HTTP Standard Methods” Retrieve GET Update PUT Create POST Remove DELETE
- 17. RESTFul Web Service “ Use Standard Methods / Uniform Interface” Safe GET Idempotent PUT Idempotent DELETE
- 18. RESTFul Web Service “ Use Standard Methods / Uniform Interface” Safe method # There are no side-effects # The requested resource stays unmodified Idempotent # Issuing the same request multiple times yields the same result
- 19. RESTFul Web Service “ All About the URIs” http://blog.mervpolis.com/roller/dwx http://blog.mervpolis.com/roller/dwx/category/Java http://blog.mervpolis.com/roller/dwx/date/201009 http://blog.mervpolis.com/roller/dwx/entry/hibernate_event_listener Directory Structure-like URIs To the Point Easy to Guess
- 20. RESTFul Web Service GET /deleteuser?name=Robert HTTP/1.1 DELETE /user/Robert HTTP/1.1
- 21. RESTFul Web Service “ Uniform Interface”
- 22. RESTFul Web Service “ Stateless” GET /resources/getNextPage? HTTP/1.1 Client Web service <?xml version=”1.0” ?> <rsp stat=”ok”> <resource id=”1” /> <resource id=”2” /> ... <rsp> PreviousPage++; NextPage= previousPage; return nextPage Stateful design
- 23. RESTFul Web Service “ Stateless” GET /resources/?page=2 HTTP/1.1 Client Web service <?xml version=”1.0” ?> <rsp page=”2” nextPage = “3” > <resource id=”1” /> <resource id=”2” /> ... <rsp> getPage(2); Stateless design
- 24. RESTFul Web Service “ Allow Multiple Representation” GET /technology Host: www.telegraph.co.uk Accept: text/html ;charset=ISO-8859-1 GET /technology /rss Host: www.telegraph.co.uk Accept: text/xml ;charset=UTF-8 <html> ... </html> <rss version="2.0"> ... </rss>