rest in peace @ php.to.start 07-11-2011

PHP.TO.START, July 11 2011 - Turin

RESTin peace

AGENDA

● Vol. 1: REST in a nutshell○Tenets○Antipatterns

● Vol. 2: To the rescue○HTTP cache○HATEOAS


Sorry for the ugly slide.

There will be others.Really sorry.


REST in a nutshell:

1. Client <> ServerPHP.TO.START, July 11 2011 - Turin

REST in a nutshell:

2. Stateless


3. Cacheable

REST in a nutshell:


REST in a nutshell:

4. Layered systemPHP.TO.START, July 11 2011 - Turin

REST in a nutshell:

5. Uniform interface


And obviously nobody had a clue


ANTIPATTERNS


1URIs


"REST is about

cool URI design"

http://apple.com/users/1/licenses/4.json


http://apple.com/site/en_US/showUsers.jsp?uid=1&license=4

is OK too


but


cool URIs help youthink in term of resources

David Zuelke


2URIs (bis)


GET /users POST /users PUT /users/{id} DELETE /users/{id} ...

REST follows a URI schema


what if you change yourURL?


Yeah, client is broken


RESTful clients shouldbe driven by service'shypermedia controls

Roy Fielding : http://roy.gbiv.com/untangled/2008/rest-apis-must-be-hypertext-driven


HATEOAS


3POST is cool


said SOAP 1.1


loosing meaningful verbs at the protocol level



nothing cacheable by default



nothing cacheable by default

what about bookmarking?


4500 is your friend


said SOAP( again )


GET /users/300Host: www.example.com


HTTP/1.1 500 Internal Server ErrorEtag: 1234X-Powered-By: php/5.3...

The record cannot be found

GET /users/300Host: www.example.com


The HTTP protocol is awesome,and lets you return meaningful anduniversally-understood status codes


404 Not Found


404 Not Found

OMG Link is broken?


202 Accepted


202 Accepted

You get an immediate OK, and the operation will hopefully complete


Pause


World Wide Web


the largest data-exchange network on the planet


And meanwhile, at Facebook...

12TB of new data every day(1 year ago)

500 million users


And meanwhile, at Google...

1 billion unique monthly googlers


via HTTP, baby!


HTTP in a nutshell:

1. Client <> ServerPHP.TO.START, July 11 2011 - Turin

HTTP in a nutshell:

2. Stateless


http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html

3. widespread cache spec

HTTP in a nutshell:


HTTP in a nutshell:

4. Layered systemOrigin server

Reverse proxy

Great chinese (fire)wall

Company proxy

Lao Tze Song using Firefox 5


HTTP in a nutshell:

5. it is the uniform interfacebetween clients and servers


HTTP bleeds REST


1.

caching & scalability


Local

Shared/proxy

Shared/reverse proxy

Types of cache


Local

Shared/proxy


Types of cache


on the server side


Caching withExpiration(example)


HTTP/1.1 200 OKHost: www.example.comExpires: 0


HTTP/1.1 200 OKHost: www.example.comExpires: Tue, 31 Jan 2011 01:00 GMT


HTTP/1.1 200 OKHost: www.example.comCache-Control: max-age=60, public



Cacheable for 60 seconds



Cacheable by both local and shared caches


but hey, you say


HTTP's cache fails when dealing with really dynamic pages, because consumers will always have to hit the

origin server, although a part of the page would be cacheable ( header and footer, for example )


Nope

Nope


ESI was built for thathttp://www.w3.org/TR/esi-lang


<esi:include src="http://php2start.com/talks/1" />


1s (tweets)

3600 post


<esi:include src='tweets.html' />

<esi:include src='article/12.html' />


So what does HTTP cache is meant to solve?


Less work


because the hard work is delegated to the browser/proxy

http://www.flickr.com/photos/snakphotography/5004775320/sizes/o/in/photostream/


evolve


because cache is abstracted from the application


loose coupling


because caching is bound to the protocol, HTTP, not to your implementation ( Sf, RoR, Django )


2.

adaptability & durability


Hypermediaanother long-time friend


Linksoutrageously semplifying


HTTP/1.1 201 CreatedHost: www.example.comEtag: 1234X-Powered-By: php/5.3Location: /users/1

POST /usersHost: www.example.com


HTTP/1.1 201 CreatedHost: www.example.comEtag: 1234X-Powered-By: php/5.3Location: /new-users-db/1

POST /usersHost: www.example.com


consumers of your API are able to followthe changes of your design


everything seems cool

But why REST?


Pros

PerformancesPHP.TO.START, July 11 2011 - Turin

Pros

Scalability


Pros

Durability


amazon.it



REST-IThttps://groups.google.com/forum/#!forum/rest-it

Alessandro Nadalin

Alessandro Nadalinodino.org


@_odino_

Thanks


@_odino_

Creditshttp://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/3568

http://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/

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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/


rest in peace @ php.to.start 07-11-2011

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