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A Bit of REST
1.
A bit of
REST (Representational State Transfer) Roy T. Fielding | Senior Principal Scientist, Adobe
2.
© 2015 Adobe
Systems Incorporated. All Rights Reserved. Warning 2 Ph.D. Dissertation
3.
REST © 2015 Adobe
Systems Incorporated. All Rights Reserved. Why talk about REST? 3 What is REST Anyway? Copyright © 2012, ZapThink, a Dovèl Technologies Company • Representational State Transfer (REST) is a style of software architecture for distributed hypermedia systems such as the World Wide Web • Roy Fielding looked at the Web and saw that it was good BUZZWORD Because has become a There’s nothing particularly wrong with that… unless you happen to be me… or working with me
4.
Jun 93 Dec
93 Jun 94 Dec 94 Jun 95 130 623 2,738 10,022 23,517 Public WWW servers [Matthew Gray] © 2015 Adobe Systems Incorporated. All Rights Reserved. A bit of context: REST also began 20 years ago 4
5.
6.
Jun 93 Dec
93 Jun 94 Dec 94 Jun 95 130 623 2,738 Public WWW servers [Matthew Gray] Using XMosaic www.ics.uci.edu wwwstat MOMspider Conditional GET 1st WWW Relative URLs HTML 2.0 2nd WWW libwww-perl © 2015 Adobe Systems Incorporated. All Rights Reserved. A bit of context: REST also began 20 years ago 4
7.
Jun 93 Dec
93 Jun 94 Dec 94 Jun 95 Public WWW servers [Matthew Gray]
8.
9.
10.
© 2015 Adobe
Systems Incorporated. All Rights Reserved. Am I going to talk about ColdFusion's implementation of REST APIs and API Management? 6 REST is NOT an implementation No,
11.
© 2015 Adobe
Systems Incorporated. All Rights Reserved. Three (very different) perspectives of the Web 7 Information http://www.w3.org/TR/html4/ 4/2/08 12:09 AM next table of contents elements attributes index HTML 4.01 Specification W3C Recommendation 24 December 1999 This version: http://www.w3.org/TR/1999/REC-html401-19991224 (plain text [794Kb], gzip'ed tar archive of HTML files [371Kb], a .zip archive of HTML files [405Kb], gzip'ed Postscript file [746Kb, 389 pages], gzip'ed PDF file [963Kb]) Latest version of HTML 4.01: http://www.w3.org/TR/html401 Latest version of HTML 4: http://www.w3.org/TR/html4 Latest version of HTML: http://www.w3.org/TR/html Previous version of HTML 4.01: http://www.w3.org/TR/1999/PR-html40-19990824 Previous HTML 4 Recommendation: http://www.w3.org/TR/1998/REC-html40-19980424 Editors: Dave Raggett <dsr@w3.org> Arnaud Le Hors, W3C Ian Jacobs, W3C Copyright ©1997-1999 W3C® (MIT, INRIA, Keio), All Rights Reserved. W3C liability, trademark, document use and software licensing rules apply. Abstract This specification defines the HyperText Markup Language (HTML), the publishing language of the World Wide Web. This specification defines HTML 4.01, which is a subversion of HTML 4. In addition to the text, multimedia, and hyperlink features of the previous versions of HTML (HTML 3.2 [HTML32] and HTML 2.0 [RFC1866]), HTML 4 supports more multimedia options, scripting languages, style sheets, better printing facilities, and documents that are more accessible to users with disabilities. HTML 4 also takes great strides towards the internationalization of documents, with the goal of making the Web truly World Wide. HTML 4 is an SGML application conforming to International Standard ISO 8879 -- Standard Generalized Markup Language [ISO8879]. Status of this document This section describes the status of this document at the time of its publication. Other documents may supersede this document. The latest status of this document series is maintained at the W3C. Fielding, et al Standards Track [Page 1] Network Working Group R. Fielding Request for Comments: 2068 UC Irvine Category: Standards Track J. Gettys J. C. Mogul DEC H. Frystyk T. Berners-Lee MIT/LCS January 1997 Hypertext Transfer Protocol -- HTTP/1.1 Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Abstract The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information systems. It is a generic, stateless, object-oriented protocol which can be used for many tasks, such as name servers and distributed object management systems, through extension of its request methods. A feature of HTTP is the typing and negotiation of data representation, allowing systems to be built independently of the data being transferred. HTTP has been in use by the World-Wide Web global information initiative since 1990. This specification defines the protocol referred to as “HTTP/1.1”. file://localhost/Users/fielding/ws/labs-webarch/uri/rfc/rfc3986.html 4/2/08 12:16 AM Network Working Group T. Berners-Lee Request for Comments: 3986 W3C/MIT Obsoletes: 2732, 2396, 1808 R. Fielding STD: 66 Day Software Updates: 1738 L. Masinter Category: Standards Track Adobe Systems January 2005 Uniform Resource Identifier (URI): Generic Syntax Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the “Internet Official Protocol Standards” (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright © The Internet Society (2005). All Rights Reserved. Abstract A Uniform Resource Identifier (URI) is a compact sequence of characters that identifies an abstract or physical resource. This specification defines the generic URI syntax and a process for resolving URI references that might be in relative form, along with guidelines and security considerations for the use of URIs on the Internet. The URI syntax defines a grammar that is a superset of all valid URIs, allowing an implementation to parse the common components of a URI reference without knowing the scheme-specific requirements of every possible identifier. This specification does not define a generative grammar for URIs; that task is performed by the individual specifications of each URI scheme. ProtocolsBrowsers
12.
© 2015 Adobe
Systems Incorporated. All Rights Reserved. Web Implementation (user view) 8
13.
© 2015 Adobe
Systems Incorporated. All Rights Reserved. Web Implementation (origin view) 9 Application Servers Dynamic Content Centralized Data RDBMS, NFS, SAN Webservers/Gateways Accelerator Cache User Agents Intermediary Proxy Cache
14.
© 2015 Adobe
Systems Incorporated. All Rights Reserved. Web Architecture 10 $ $ $ $ $ $ $ $User Agents Proxies Gateways Origin Servers Architecture is a vertical abstraction on implementation
15.
© 2015 Adobe
Systems Incorporated. All Rights Reserved. Web Architecture 11 http://www.w3.org/TR/html4/ 4/2/08 12:09 AM next table of contents elements attributes index HTML 4.01 Specification W3C Recommendation 24 December 1999 This version: http://www.w3.org/TR/1999/REC-html401-19991224 (plain text [794Kb], gzip'ed tar archive of HTML files [371Kb], a .zip archive of HTML files [405Kb], gzip'ed Postscript file [746Kb, 389 pages], gzip'ed PDF file [963Kb]) Latest version of HTML 4.01: http://www.w3.org/TR/html401 Latest version of HTML 4: http://www.w3.org/TR/html4 Latest version of HTML: http://www.w3.org/TR/html Previous version of HTML 4.01: http://www.w3.org/TR/1999/PR-html40-19990824 Previous HTML 4 Recommendation: http://www.w3.org/TR/1998/REC-html40-19980424 Editors: Dave Raggett <dsr@w3.org> Arnaud Le Hors, W3C Ian Jacobs, W3C Copyright ©1997-1999 W3C® (MIT, INRIA, Keio), All Rights Reserved. W3C liability, trademark, document use and software licensing rules apply. Abstract This specification defines the HyperText Markup Language (HTML), the publishing language of the World Wide Web. This specification defines HTML 4.01, which is a subversion of HTML 4. In addition to the text, multimedia, and hyperlink features of the previous versions of HTML (HTML 3.2 [HTML32] and HTML 2.0 [RFC1866]), HTML 4 supports more multimedia options, scripting languages, style sheets, better printing facilities, and documents that are more accessible to users with disabilities. HTML 4 also takes great strides towards the internationalization of documents, with the goal of making the Web truly World Wide. HTML 4 is an SGML application conforming to International Standard ISO 8879 -- Standard Generalized Markup Language [ISO8879]. Status of this document This section describes the status of this document at the time of its publication. Other documents may supersede this document. The latest status of this document series is maintained at the W3C. Fielding, et al Standards Track [Page 1] Network Working Group R. Fielding Request for Comments: 2068 UC Irvine Category: Standards Track J. Gettys J. C. Mogul DEC H. Frystyk T. Berners-Lee MIT/LCS January 1997 Hypertext Transfer Protocol -- HTTP/1.1 Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Abstract The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information systems. It is a generic, stateless, object-oriented protocol which can be used for many tasks, such as name servers and distributed object management systems, through extension of its request methods. A feature of HTTP is the typing and negotiation of data representation, allowing systems to be built independently of the data being transferred. HTTP has been in use by the World-Wide Web global information initiative since 1990. This specification defines the protocol referred to as “HTTP/1.1”. file://localhost/Users/fielding/ws/labs-webarch/uri/rfc/rfc3986.html 4/2/08 12:16 AM Network Working Group T. Berners-Lee Request for Comments: 3986 W3C/MIT Obsoletes: 2732, 2396, 1808 R. Fielding STD: 66 Day Software Updates: 1738 L. Masinter Category: Standards Track Adobe Systems January 2005 Uniform Resource Identifier (URI): Generic Syntax Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the “Internet Official Protocol Standards” (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright © The Internet Society (2005). All Rights Reserved. Abstract A Uniform Resource Identifier (URI) is a compact sequence of characters that identifies an abstract or physical resource. This specification defines the generic URI syntax and a process for resolving URI references that might be in relative form, along with guidelines and security considerations for the use of URIs on the Internet. The URI syntax defines a grammar that is a superset of all valid URIs, allowing an implementation to parse the common components of a URI reference without knowing the scheme-specific requirements of every possible identifier. This specification does not define a generative grammar for URIs; that task is performed by the individual specifications of each URI scheme. Protocols Web protocols define that vertical abstraction on implementation
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. So, is REST the Web Architecture? 12 REST is NOT an architecture! No,
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. Original proposal for the World Wide Web 13 This document "Hypertext" Linked information Hypermedia CERNDOC ENQUIRE Tim Berners-Lee section group C.E.R.N wrote division Hierarchical systems for example for example describes includes for example A Proposal "Mesh" Hyper Card uucp News IBM GroupTalk VAX/ NOTES Computer conferencing describes includes includes Comms ACM describes refers to describes etc group unifies [Berners-Lee, 1989]
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Linked information CERNDOC ENQUIRE Hierarchical systems for example for examplefor
example A Proposal "Mesh" Hyper Card uucp News IBM GroupTalk VAX/ NOTES Computer conferencing describes unifies © 2015 Adobe Systems Incorporated. All Rights Reserved. The Web is an application integration system 14 [Berners-Lee, 1989]
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Linked information CERNDOC ENQUIRE Hierarchical systems for example for examplefor
example A Proposal "Mesh" Hyper Card uucp News IBM GroupTalk VAX/ NOTES Computer conferencing describes unifies © 2015 Adobe Systems Incorporated. All Rights Reserved. The Web is an application integration system 14 [Berners-Lee, 1989]
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. Network-based Applications • Application § short for “applying a computer to accomplish a given purpose” § examples: finding a document, managing a bank account, or buying a travel ticket • Network-based § operating over the network with full knowledge of the user § i.e., unlike distributed, which intentionally hides the network 15
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. Architectural Styles §A horizontal abstraction across multiple architectures (vertical abstractions) § names a repeated architectural pattern § defined by its design constraints § chosen for the properties they induce § REST is an architectural style § for network-based applications § to induce a specific set of architectural properties § desired for the World Wide Web 16 Ionic Order
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. REST is an accumulation of design constraints that induce architectural properties 17 Figure 5-9. REST Derivation by Style Constraints RR CS LS VM U CSS LCS COD$ C$SS LC$SS LCODC$SS REST replicated on-demand separated layered mobile uniform interface stateless shared intermediate processing cacheable extensible simple reusable scalable reliable multi- org. visible programmable
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. REST is an accumulation of design constraints that induce architectural properties 17 Figure 5-9. REST Derivation by Style Constraints RR CS LS VM U CSS LCS COD$ C$SS LC$SS LCODC$SS REST replicated on-demand separated layered mobile uniform interface stateless shared intermediate processing cacheable extensible simple reusable scalable reliable multi- org. visible programmable Constraint
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. REST is an accumulation of design constraints that induce architectural properties 17 Figure 5-9. REST Derivation by Style Constraints RR CS LS VM U CSS LCS COD$ C$SS LC$SS LCODC$SS REST replicated on-demand separated layered mobile uniform interface stateless shared intermediate processing cacheable extensible simple reusable scalable reliable multi- org. visible programmable Property
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[photobydhester:http://mrg.bz/xVLmr1]
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[photobyEmmiP:http://mrg.bz/P7BJRi]
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[photobyrupertjefferies:http://mrg.bz/Y9XThf]
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. REST’s Five Uniform Interface Constraints §All important resources are identified by one resource identifier mechanism § induces simple, visible, reusable, stateless communication §Access methods have the same semantics for all resources § induces visible, scalable, available through layered system, cacheable, and shared caches §Resources are manipulated through the exchange of representations § induces simple, visible, reusable, cacheable, and evolvable (information hiding) §Representations are exchanged via self-descriptive messages § induces visible, scalable, available through layered system, cacheable, and shared caches § induces evolvable via extensible communication §Hypertext as the engine of application state § induces simple, visible, reusable, and cacheable through data-oriented integration § induces evolvable (loose coupling) via late binding of application transitions 21
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. Why the hypermedia constraint? Hypertext as the Engine of Application State each state can be dynamic each transition can be redirected 22 S0 S2S1 S3 R o y * *
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. The client only needs to know one state and its transitions! Follow Your Nose 23 S0 SS1 SR o y * *
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. The client only needs to know one state and its transitions! Follow Your Nose 24 S0 S2S1 SR o y * *
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. The client only needs to know one state and its transitions! Follow Your Nose 25 S0 S2S S3 R o y * *
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. The client only needs to know one state and its transitions! Follow Your Nose 26 S SS S3 R o y * *
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. Know Your Audience REST emphasizes evolvability to sustain an uncontrollable system If you think you have control over the system or aren’t interested in evolvability, don’t waste your time arguing about REST 27
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. What is the most common question about REST? 28 REST API? So, where is your …
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. Sorry, it's not that simple An API that provides network-based access to resources via a uniform interface of self-descriptive messages containing hypertext to indicate potential state transitions might be part of an overall system that is a RESTful application 29
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. Some tips for building an API for RESTful applications §Identify all of the resources § few resources are atomic; most are collections or views of other resources § don't confuse identity (naming) with containment (storage) § use access control, not obscurity, to control publication § resources have more in common with stored procedures than they do with records or files §Iteratively develop resources and state transitions (use cases) § don't try to do everything at once § don't make any assumptions about received content, order, versioning, etc. §Be flexible regarding media types and access protocols § start by prototyping in HTML and exploring with browsers and spiders § if you need to publish JSON, use a profile that defines hypertext semantics § use relative URLs wherever possible (to save space and improve portability) 30
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. Don’t over-think the problem space a RESTful API is just a website for users with a limited vocabulary (machine to machine interaction) 31
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. Don’t under-think the problem space building a good website is not easy (but it has been done before) 32
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. So, what does that mean for ColdFusion? Why are we using an API designed by Sun/Oracle to build a website? 33
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© 2015 Adobe
Systems Incorporated. All Rights Reserved. So, what does that mean for ColdFusion? Why are we using an API designed by Sun/Oracle to build a website? Wouldn't it be better to use a language for rapid application development that could automatically select its output serialization to match the media type in which it is embedded? 33
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© 2015 Adobe
Systems Incorporated. All Rights Reserved.
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