Intro to REST Joe Gregorio Google. REST is an Architectural Style.

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Presentation transcript:

Intro to REST Joe Gregorio Google

REST is an Architectural Style

Shaker Architectural Style

REST Architectural Style HTT P

Why?

The Web Client Web Server Request Response

Request GET /news/ HTTP/1.1 Host: example.org Accept-Encoding: compress, gzip User-Agent: Python-httplib2

Response HTTP/ Ok Date: Thu, 07 Aug :06:24 GMT Server: Apache ETag: "85a1b765e8c01dbf872651d7a5" Content-Type: text/html Cache-Control: max-age=

GET /news/ HTTP/1.1 Host: example.org Accept-Encoding: compress, gzip User-Agent: Python-httplib2 Resource =

GET /news/ HTTP/1.1 Host: example.org Accept-Encoding: compress, gzip User-Agent: Python-httplib2 Method = GET

Methods GET – Safe, Idempotent, Cacheable PUT – Idempotent DELETE – Idempotent HEAD – Safe, Idempotent POST

... Representation

... Home... Hypertext

... <link href="/css/b/base.css" type="text/css" rel="stylesheet">... Hypertext

... <script src="utility.js" type="text/javascript">... Code on Demand

... Server: Apache ETag: "85a1b765e8c01dbf872651d7a5" Content-Type: text/html Cache-Control: max-age= Control Data

Characteristics Resources – URI – Uniform Interface Methods Representation Protocol – Client-Server – Stateless – Cacheable – Layered

Characteristics Resources – URI – Uniform Interface Methods Representation Protocol – Client-Server – Stateless – Cacheable – Layered

Characteristics Resources – URI – Uniform Interface Methods Representation Protocol – Client-Server – Stateless – Cacheable – Layered

Characteristics Resources – URI – Uniform Interface Methods Representation Protocol – Client-Server – Stateless – Cacheable – Layered

Characteristics Resources – URI – Uniform Interface Methods Representation Protocol – Client-Server – Stateless – Cacheable – Layered

Characteristics Resources – URI – Uniform Interface Methods Representation Protocol – Client-Server – Stateless – Cacheable – Layered

The Web Client Web Server Request Response

The Web User Agent Origin Server Request Response

Intermediaries User Agent Origin Server Inter medi aries

Characteristics Resources – URI – Uniform Interface Methods Representation Protocol – Client-Server – Stateless – Cacheable – Layered

Characteristics Resources – URI – Uniform Interface Methods Representation Protocol – Client-Server – Stateless – Cacheable – Layered

Intermediaries User Agent Origin Server Prox ies Gate way s

Intermediaries User Agent Origin Server Prox ies Gate way s CCCC

... Server: Apache ETag: "85a1b765e8c01dbf872651d7a5" Content-Type: text/html Cache-Control: max-age=

Cache Hit User Agent Origin Server Inte rme diar y C

Characteristics Resources – URI – Uniform Interface Methods Representation Protocol – Client-Server – Stateless – Cacheable – Layered

Benefits Network Performance Efficiency Scalability User Perceived Performance

Benefits Network Performance Efficiency Scalability User Perceived Performance

Benefits Network Performance Efficiency Scalability User Perceived Performance

Benefits Network Performance Efficiency Scalability User Perceived Performance

Other Benefits simplicity evolvability extensibility customizability configuration reusability visibility portability reliability

Benefits Aren't Free

Comparison XML-RPC Atom Publishing Protocol

XML-RPC It's remote procedure calling using HTTP as the transport and XML as the encoding. XML- RPC is designed to be as simple as possible, while allowing complex data structures to be transmitted, processed and returned.

POST /RPC2 HTTP/1.0 User-Agent: Frontier/5.1.2 (WinNT) Host: betty.userland.com Content-Type: text/xml Content-length: 181 getStateName...

HTTP/ OK Connection: close Content-Length: 158 Content-Type: text/xml Date: Fri, 17 Jul :55:08 GMT Maine...

POST /RPC2 HTTP/1.0 User-Agent: Frontier/5.1.2 (WinNT) Host: betty.userland.com Content-Type: text/xml Content-length: 181 getStateName...

POST /RPC2 HTTP/1.0 User-Agent: Frontier/5.1.2 (WinNT) Host: betty.userland.com Content-Type: text/xml Content-length: 181 getStateName...

Atom Publishing Protocol The Atom Publishing Protocol (AtomPub) is an application-level protocol for publishing and editing Web resources. The protocol is based on HTTP transfer of Atom-formatted representations. The Atom format is documented in the Atom Syndication Format. [RFC 5023]

Service Document A document that describes the location and capabilities of one or more Collections, grouped into Workspaces. [RFC 5023]

GET a Service Document GET /collection/ HTTP/1.0 Host: example.com

HTTP/ Ok Date: Thu, 14 Aug :26:31 GMT Server: Apache Content-Length: 753 Vary: Accept-Encoding,User-Agent Content-Type: application/atomsvc+xml <service xmlns="

entry...

GET a Collection GET /collection/entry/ HTTP/1.0 Host: example.com

HTTP/ Ok Date: Thu, 14 Aug :26:31 GMT Server: Apache Content-Length: 753 Vary: Accept-Encoding,User-Agent Content-Type: application/atom+xml <feed xmlns="

<feed... Example...

Lists I Like <link href=" rel="edit" />...

As you can see, benefits

Long-lived Images Set the cache for images to very long time. If you need to update the image, upload a new image to a new URI and change the HTML to point to that new URI.

HTML......

Image HTTP/ Ok Date: Thu, 15 Aug :26:31 GMT Server: Apache Content-Length: Cache-Control: max-age=

HTML......

Further Reading ● RFC 2616 ● RFC 3986 ● Architectural Styles and the Design of Network-based Software Architectures ● Caching Tutorial