REST in peace @ Osidays 2011 India 11-21-2011

RESTin peaceBengaluru, 20-22 November 2011

Sorry for the ugly slide. There will be others. Really sorry. Bengaluru, 20-22 November 2011

REST in a nutshell Bengaluru, 20-22 November 2011

2000 Fieldings dissertation: REpresentational State Transferhttp://www.ics.uci.edu/~fielding/pubs/dissertation/rest_arch_style.htm Bengaluru, 20-22 November 2011

REST in a nutshell:1. Client <> Server Bengaluru, 20-22 November 2011

REST in a nutshell: 2. Stateless Bengaluru, 20-22 November 2011

Servers do not keep anyinformations the clients uses during different requests. Bengaluru, 20-22 November 2011

So the architecture scales well. Bengaluru, 20-22 November 2011

REST in a nutshell: 3. Cacheable Bengaluru, 20-22 November 2011

Client has access toresources stored between it and the origin server. Bengaluru, 20-22 November 2011

So communication is faster. Bengaluru, 20-22 November 2011

REST in a nutshell:4. Layered system Bengaluru, 20-22 November 2011

Intermediary nodes can beused along our architecture. Bengaluru, 20-22 November 2011

So you efficiently implement point 3. Bengaluru, 20-22 November 2011

REST in a nutshell: 5. Uniform interface Bengaluru, 20-22 November 2011

Communicate using well-known verbs and providing all the informations needed to consume a service. Bengaluru, 20-22 November 2011

So fallbacks are easy. Bengaluru, 20-22 November 2011

this was a bit difficult to understand so, obviously... Bengaluru, 20-22 November 2011

nobody had a clue Bengaluru, 20-22 November 2011

ANTIPATTERNS Bengaluru, 20-22 November 2011

1 URIsBengaluru, 20-22 November 2011

"REST is about cool URI design"http://apple.com/users/1/licenses/4.json Bengaluru, 20-22 November 2011

http://apple.com/site/en_US/showUsers.jsp?uid=1&license=4 is OK too Bengaluru, 20-22 November 2011

but, enter simple rule of thumb Bengaluru, 20-22 November 2011

cool URIs help youthink in term of resources - David Zuelke Bengaluru, 20-22 November 2011

2 URIs (bis)Bengaluru, 20-22 November 2011

REST follows a URI schema GET /users POST /users PUT /users/{id} DELETE /users/{id} ... Bengaluru, 20-22 November 2011

what if you change your URL? Bengaluru, 20-22 November 2011

client isbroken Bengaluru, 20-22 November 2011

RESTful clients should be driven by services hypermedia controlsRoy Fielding : http://roy.gbiv.com/untangled/2008/rest-apis-must-be-hypertext-driven Bengaluru, 20-22 November 2011

HATEOAS Bengaluru, 20-22 November 2011

3POST is coolBengaluru, 20-22 November 2011

said SOAP 1.1 Bengaluru, 20-22 November 2011

loosing meaningful verbs at the protocol level Bengaluru, 20-22 November 2011

loosing meaningful verbs at the protocol level nothing cacheable by default Bengaluru, 20-22 November 2011

loosing meaningful verbs at the protocol level nothing cacheable by default what about bookmarking? Bengaluru, 20-22 November 2011

4500 is your friend Bengaluru, 20-22 November 2011

said SOAP ( again ) Bengaluru, 20-22 November 2011

GET /users/300Host: www.example.comBengaluru, 20-22 November 2011

GET /users/300 Host: www.example.comHTTP/1.1 500 Internal Server ErrorEtag: 1234X-Powered-By: php/5.3...The record cannot be found Bengaluru, 20-22 November 2011

The HTTP protocol is awesome,and lets you return meaningful anduniversally-understood status codes Bengaluru, 20-22 November 2011

404 Not FoundBengaluru, 20-22 November 2011

404 Not Found OMG Link is broken?Bengaluru, 20-22 November 2011

202 AcceptedBengaluru, 20-22 November 2011

202 AcceptedYou get an immediate OK, and the operation will hopefully complete Bengaluru, 20-22 November 2011

PauseBengaluru, 20-22 November 2011

The WWW Bengaluru, 20-22 November 2011

the largest data-exchange network on the planet Bengaluru, 20-22 November 2011

And meanwhile, at Facebook...12TB of new data every day (1 year ago) 500 million users Bengaluru, 20-22 November 2011

And meanwhile, at Google... 1 billionunique monthly googlers Bengaluru, 20-22 November 2011

via HTTP , baby! Bengaluru, 20-22 November 2011

HTTP in a nutshell:1. Client <> Server Bengaluru, 20-22 November 2011

HTTP in a nutshell: 2. Stateless Bengaluru, 20-22 November 2011

HTTP in a nutshell:3. widespread cache spec http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html Bengaluru, 20-22 November 2011

HTTP in a nutshell: Lao Tze Song using Firefox 6 Company proxy Great chinese (fire)wall Reverse proxy Origin server4. Layered system Bengaluru, 20-22 November 2011

HTTP in a nutshell: 5. it is the uniform interface between clients and servers Bengaluru, 20-22 November 2011

HTTP bleeds REST Bengaluru, 20-22 November 2011

How do Iimplement thisgoodness? Bengaluru, 20-22 November 2011

1.caching & scalability Bengaluru, 20-22 November 2011

HTTP cache Bengaluru, 20-22 November 2011

Types of cache Local Shared/proxy Shared/reverse proxy Bengaluru, 20-22 November 2011

Bengaluru, 20-22 November 2011

Types of cache Local Shared/proxy Shared/reverse proxy Bengaluru, 20-22 November 2011

Types of cache Local Shared/proxyShared/reverse proxy Bengaluru, 20-22 November 2011

on the server sideBengaluru, 20-22 November 2011

Caching with Expiration (example) Bengaluru, 20-22 November 2011

HTTP/1.1 200 OKHost: www.example.comExpires: 0 Bengaluru, 20-22 November 2011

HTTP/1.1 200 OKHost: www.example.comExpires: Tue, 31 Jan 2011 01:00 GMT Bengaluru, 20-22 November 2011

HTTP/1.1 200 OKHost: www.example.comCache-Control: max-age=60, public Bengaluru, 20-22 November 2011

HTTP/1.1 200 OKHost: www.example.comCache-Control: max-age=60, public Cacheable for 60 seconds Bengaluru, 20-22 November 2011

HTTP/1.1 200 OKHost: www.example.comCache-Control: max-age=60, publicCacheable by both local and shared caches Bengaluru, 20-22 November 2011

You can also cache with validation(Etags, If-None-Match, ...) Bengaluru, 20-22 November 2011

Why HTTP caching is so important? Bengaluru, 20-22 November 2011

Ask yourself:as a developer, what do I want on my application? Bengaluru, 20-22 November 2011

Evolve Loose coupling Work lessBengaluru, 20-22 November 2011

EvolveBecause you want your platform to extensible Loose coupling Work less Bengaluru, 20-22 November 2011

EvolveBecause you want your platform to extensible Loose couplingBecause you want it to be easy to integrate with, evolve, plugand mantain Work less Bengaluru, 20-22 November 2011

EvolveBecause you want your platform to extensible Loose couplingBecause you want it to be easy to integrate with, evolve, plugand mantain Work lessBecause every LoC is bug-prone and our man-day is a hard-to-scale cost Bengaluru, 20-22 November 2011

enters our Hero #1Bengaluru, 20-22 November 2011

enters our Hero #2Bengaluru, 20-22 November 2011

http://www.lullabot.com/articles/a-beginners-guide-to-caching-data Bengaluru, 20-22 November 2011

2007Bengaluru, 20-22 November 2011

2011?Bengaluru, 20-22 November 2011

it supportsHTTP caching! http://drupal.org/node/147310 Bengaluru, 20-22 November 2011

it supportsHTTP caching! http://drupal.org/node/147310 ( people is supposed to clap their hands here ) Bengaluru, 20-22 November 2011

butBengaluru, 20-22 November 2011

wait.... how? Bengaluru, 20-22 November 2011

Default headersExpires = Sun, 19 Nov 1978 05:00:00 GMT,Cache-Control = no-cache, must-revalidate,ETag = $_SERVER[REQUEST_TIME], Bengaluru, 20-22 November 2011

is that even legal?Bengaluru, 20-22 November 2011

"but you can redefine them!" Bengaluru, 20-22 November 2011

drupal_add_http_header() Bengaluru, 20-22 November 2011

function drupal_add_http_header(){ ... ... drupal_send_headers($headers);} Bengaluru, 20-22 November 2011

so, whatdrupal_send_headers() can do so evil? Bengaluru, 20-22 November 2011

header() , of course Bengaluru, 20-22 November 2011

which meansBengaluru, 20-22 November 2011

drupal_add_http_header(Dumb-Header, Im batman!);...// other logic...drupal_add_http_header(Dumb-Header, Im not);var_dump(headers_list()); Bengaluru, 20-22 November 2011

drupal_add_http_header(Dumb-Header, Im batman!);...// other logic...drupal_add_http_header(Dumb-Header, Im not);var_dump(headers_list());array 0 => string X-Powered-By: PHP/5.3.2-1ubuntu4.7 1 => string Dump-Header: Im not Bengaluru, 20-22 November 2011

drupal_add_http_header(Dumb-Header, Im batman!);...// other logic...drupal_add_http_header(Dumb-Header, false);var_dump(headers_list()); Bengaluru, 20-22 November 2011

drupal_add_http_header(Dumb-Header, Im batman!);...// other logic...drupal_add_http_header(Dumb-Header, false);var_dump(headers_list());array 0 => string X-Powered-By: PHP/5.3.2-1ubuntu4.7 1 => string Dump-Header: Im batman Bengaluru, 20-22 November 2011

drupal_add_http_header(Dumb-Header, Im batman!);...// other logic...drupal_add_http_header(Dumb-Header, );var_dump(headers_list()); Bengaluru, 20-22 November 2011

drupal_add_http_header(Dumb-Header, Im batman!);...// other logic...drupal_add_http_header(Dumb-Header, );var_dump(headers_list());array 0 => string X-Powered-By: PHP/5.3.2-1ubuntu4.7 1 => string Dumb-Header: Bengaluru, 20-22 November 2011

orBengaluru, 20-22 November 2011

you can use header_remove() ( PHP 5.3 ) Bengaluru, 20-22 November 2011

and create a new class to manage/keep track ofheaders and caching directives Bengaluru, 20-22 November 2011

but were lazy andwe dont want to reinvent the wheel Bengaluru, 20-22 November 2011

GoalsWork less evolve loose coupling Bengaluru, 20-22 November 2011

everything is done for us! :) but.... Bengaluru, 20-22 November 2011

tmp files, cache tables, procedural code... mmmmh.... gotta be something better Bengaluru, 20-22 November 2011

FrameworksBengaluru, 20-22 November 2011

ONEBengaluru, 20-22 November 2011

Cache is used for compiling routes, autoloading, ... Bengaluru, 20-22 November 2011

Cache is used for compiling routes, autoloading, ... ...but also for storing the view Bengaluru, 20-22 November 2011

GoalsWork less evolve loose coupling Bengaluru, 20-22 November 2011

at least because we use a framework Bengaluru, 20-22 November 2011

Less workBengaluru, 20-22 November 2011

http://www.flickr.com/photos/snakphotography/5004775320/sizes/o/in/photostream/ because the hard work is delegated to the browser/proxy Bengaluru, 20-22 November 2011

EvolveBengaluru, 20-22 November 2011

because cache is abstracted from the application Bengaluru, 20-22 November 2011

Loose coupling Bengaluru, 20-22 November 2011

because caching is bound to the protocol, HTTP, notto your implementation ( Sf, RoR, Django ) Bengaluru, 20-22 November 2011

but hey, you sayBengaluru, 20-22 November 2011

HTTPs cache fails when dealing with really dynamicpages, because consumers will always have to hit the origin server, although a part of the page would be cacheable ( header and footer, for example ) Bengaluru, 20-22 November 2011

Nope NopeBengaluru, 20-22 November 2011

ESI was built for that http://www.w3.org/TR/esi-lang Bengaluru, 20-22 November 2011

Edge Side Includes A de facto standard for bla bla bla... Bengaluru, 20-22 November 2011

Edge Side Includes A de facto standard for bla bla bla... Server side includes ( not SSI! ) usually handled by the architectures ESI processor. http://www.w3.org/TR/esi-lang http://www.w3.org/TR/edge-arch

<esi:include src="http://osidays.com/talks/1" /> Bengaluru, 20-22 November 2011

1s (tweets)3600 (post) Bengaluru, 20-22 November 2011

<esi:include src=tweets.html /><esi:include src=article/12.html /> Bengaluru, 20-22 November 2011

2.adaptability & durability Bengaluru, 20-22 November 2011

Hypermedia another long-time friend Bengaluru, 20-22 November 2011

Linksoutrageously semplifying Bengaluru, 20-22 November 2011

<img src="..." /><a href="..." /><link rel="payment" ... /> Bengaluru, 20-22 November 2011

POST /users Host: www.example. comHTTP/1.1 201 CreatedHost: www.example.comEtag: 1234X-Powered-By: php/5.3Location: /users/1 Bengaluru, 20-22 November 2011

POST /users Host: www.example. comHTTP/1.1 201 CreatedHost: www.example.comEtag: 1234X-Powered-By: php/5.3Location: /new-users-db/1 Bengaluru, 20-22 November 2011

consumers of your API are able to follow the changes of your design Bengaluru, 20-22 November 2011

Client knows how to consume theservice based on the informationsauto-provided by the service itself Bengaluru, 20-22 November 2011

No WSDL.Bengaluru, 20-22 November 2011

No URI templates.Bengaluru, 20-22 November 2011

No easily-outdated documentation. Bengaluru, 20-22 November 2011

No assumptions.Bengaluru, 20-22 November 2011

Less WTFs.Bengaluru, 20-22 November 2011

This does not easily break. Bengaluru, 20-22 November 2011

HATEOASHypermedia As The Engine Of Application State Bengaluru, 20-22 November 2011

6Bengaluru, 20-22 November 2011

everythingseems eventually coolRecap: why REST? Bengaluru, 20-22 November 2011

ProsPerformances Bengaluru, 20-22 November 2011

ProsScalability Bengaluru, 20-22 November 2011

Pros DurabilityBengaluru, 20-22 November 2011

Not RESTful? Bengaluru, 20-22 November 2011

Simply dont care Bengaluru, 20-22 November 2011

Rules of architectural design Bengaluru, 20-22 November 2011

Follow them according to your needs Bengaluru, 20-22 November 2011

amazon.comBengaluru, 20-22 November 2011

So...Bengaluru, 20-22 November 2011

Alessandro Nadalin Bengaluru, 20-22 November 2011

odino.orgBengaluru, 20-22 November 2011

@_odino_ #osidaysBengaluru, 20-22 November 2011

Thank YOU!@_odino_ Bengaluru, 20-22 November 2011

Credits http://www.flickr.com/photos/larachris/16564077/sizes/o/in/photostream/ http://www.flickr.com/photos/ashatenbroeke/4367373081/sizes/z/in/photostream/ http://www.flickr.com/photos/yourdon/3140270189/sizes/l/in/photostream/ http://www.flickr.com/photos/jox1989/4964706072/sizes/l/in/photostream/ http://www.flickr.com/photos/brainfg/168506259/sizes/o/in/photostream/ http://www.flickr.com/photos/norte_it/3897091546/sizes/o/in/photostream/ http://www.zdnet.com/blog/service-oriented/soap-versus-rest-a-matter-of-style/3568http://www.flickr.com/photos/turtlemom_nancy/2046347762/sizes/l/in/photostream/ http://www.flickr.com/photos/juanpg/3333385784/sizes/z/in/photostream/ http://www.flickr.com/photos/congvo/301678287/sizes/l/in/photostream/ http://www.flickr.com/photos/ihasb33r/2573196546/sizes/z/in/photostream/ http://www.flickr.com/photos/martin_heigan/4544138976/sizes/o/in/photostream/ http://www.flickr.com/photos/cknara/4195099999/sizes/o/in/photostream/ http://www.flickr.com/photos/1080p/3076529265/sizes/l/in/photostream/ http://www.flickr.com/photos/adamrice/280300202/sizes/l/in/photostream/ http://www.flickr.com/photos/tomer_a/541411897/sizes/o/in/photostream/ http://www.flickr.com/photos/subpra/4514008262/sizes/l/in/photostream/ http://www.flickr.com/photos/lippincott/2539720043/sizes/l/in/photostream/ http://www.flickr.com/photos/rawryder/5086090931/sizes/l/in/photostream/ http://www.flickr.com/photos/robboudon/5312731161/sizes/l/in/photostream/ http://www.flickr.com/photos/bc-burnslibrary/4158243488/sizes/o/in/photostream/http://www.flickr.com/photos/13606325@N08/2416993706/sizes/o/in/photostream/ http://www.flickr.com/photos/neothezion/5135841069/sizes/l/in/photostream/ http://www.flickr.com/photos/planetschwa/2494067809/ http://www.flickr.com/photos/thomasthomas/258931782/ http://www.flickr.com/photos/rustyboxcars/2629631562/sizes/l/in/photostream/ http://www.flickr.com/photos/ell-r-brown/4138727474/sizes/l/in/photostream/ http://www.flickr.com/photos/noah123/5082076630/sizes/z/in/photostream/ http://www.flickr.com/photos/jungle_boy/220181177/sizes/l/in/photostream/ http://www.flickr.com/photos/prettydaisies/872539081/sizes/l/in/photostream/ http://www.flickr.com/photos/kaptainkobold/76256150/sizes/o/in/photostream/ http://www.flickr.com/photos/uomoincravatta/1438372865/sizes/z/in/photostream/ Bengaluru, 20-22 November 2011

http://us-w1.rockmelt.com	3
http://www.mefeedia.com	2
http://a0.twimg.com	1
http://odino.org	1

REST in peace @ Osidays 2011 India 11-21-2011

by Alessandro Nadalin

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REST in peace @ Osidays 2011 India 11-21-2011 Presentation Transcript