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Don’t screw it up!
@cirpo @_odino_
How to build
durable
web APIs
How to build
durable
web APIs
1. Can you predict
the future?
Dubai Marina, ~2000
Dubai Marina, 2014
Can you really predict the future?
If there’s one thing we learned over
the past 5 years of development...
Monoliths are disappearing
Full stack is dead
Microservice Architecture, [...] a
particular way of designing software
applications as suites of
independently deployable services
http://martinfowler.com/articles/microservices.html
“
”
Full stack is dead
Microservice Architecture, [...] a
particular way of designing software
applications as suites of
independently deployable services
http://martinfowler.com/articles/microservices.html
“
”
SERVICE-ORIENTED
ARCHITECTURES
LEGO, something new in a geek presentation...
FROM
a single page application written in
TO
an hybrid solution
In TWO weeks!
HOW???
APIs written in PHP <3
Everyone wants APIs
Everyday normal services
dev-oriented services
API maniacs
2. HTTP is here to
stay
GET vs POST
“The difference is that in
a GET request you have the parameters in the url ,
with
a POST the parameters are in the request’s body”
GET vs POST
HTTP FUNDAMENTALS
HTTP FUNDAMENTALS
GET POST
HTTP FUNDAMENTALS
GET POST
PUT
HEAD
DELETEPATCH
OPTIONS
HTTP FUNDAMENTALS
HEADERS
Accept
Accept-Encoding Accept-Language
Cookie
Content-Type
Referer
If-Modified-Since
If-None-Match
Origin User-Agent
Cache-Control
HTTP FUNDAMENTALS
CUSTOM HEADERS
N-LocationN-Locale
N-Device
N-Platform
N-App
N-Theme
WAKA
“A new protocol designed to
match the efficiency of
well-designed Web
Applications”
http://tools.ietf.org/agenda/83/slides/slides-83-httpbis-5.pdf
SPDY/1..3
A protocol “invented” by Google, which supports:
extended compression
multiplexing
prioritization
server push
SPDY/1..3
A protocol “invented” by Google, which supports:
extended compression
multiplexing
prioritization
server push
SPDY/1..3
A protocol “invented” by Google, which supports:
extended compression
multiplexing
prioritization
server push
SPDY/1..3
A protocol “invented” by Google, which supports:
extended compression
multiplexing
prioritization
server push
SPDY/1..3
A protocol “invented” by Google, which supports:
extended compression
multiplexing
prioritization
server push
HTTP/2.0
HTTP/2.0
based on SPDY
HTTP/2.0
which is a faster
version of HTTPS
HTTP/2.0
which is a safer
version of HTTP
HTTP is definitely here to stay,
semantics won’t change
3. Plan for failure
Work around bugs
https://gist.github.com/odino/11295759/revisions
Work around bugs
https://gist.github.com/odino/11295759/revisions
Failover
HTTP/1.1 200 OK
Date: Fri, 25 Apr 2014 16:52:37 GMT
Content-Type: application/json
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Encoding
Cache-Control: stale-if-error=3600, stale-while-revalidate=6000
Age: 0
Via: 1.1 varnish
X-Cache: MISS
Alternate-Protocol: 443:npn-spdy/2
Failover
HTTP/1.1 200 OK
Date: Fri, 25 Apr 2014 16:52:37 GMT
Content-Type: application/json
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Encoding
Cache-Control: stale-if-error=3600, stale-while-revalidate=6000
Age: 0
Via: 1.1 varnish
X-Cache: MISS
Alternate-Protocol: 443:npn-spdy/2
Failover
HTTP/1.1 200 OK
Date: Fri, 25 Apr 2014 16:52:37 GMT
Content-Type: application/json
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Encoding
Vary: Accept-Encoding
Cache-Control: stale-if-error=3600, stale-while-revalidate=6000
Age: 0
Via: 1.1 varnish
X-Cache: MISS
alternate-protocol: : 443:npn-spdy/2
Alternate-Protocol: 443:npn-spdy/2
cache available
if the backend
is down
Design mistakes?
Versioning to the rescue
Versioning to the rescue
https://gist.github.com/odino/bf4c7468cba8b16c6493
Versioning to the rescue
https://gist.github.com/odino/f820dda941bf44aa7605
Versioning to the rescue
https://gist.github.com/odino/b5d963d8f8aec904d76c
Versioning to the rescue
https://gist.github.com/odino/0fbb5be8113deed752fc
How to detect the version?
How to detect the version?
api.domain.org/v1/...
How to detect the version?
SIMPLE
How to detect the version?
...but how to detect it?
Detecting the version
https://gist.github.com/odino/f5a1026449e35cfa8a29
Detecting the version
https://gist.github.com/odino/f5a1026449e35cfa8a29
Here it belongs to
the route/controller,
you need it at the
Request level
Detecting the version
https://gist.github.com/odino/f5a1026449e35cfa8a29
Use a header!
Detecting the version
https://gist.github.com/odino/bf4c7468cba8b16c6493
Can’t test it easily!
Let Nginx do the dirty work
https://gist.github.com/odino/6750004f735c8d08687d
Let Nginx do the dirty work
https://gist.github.com/odino/6750004f735c8d08687d
example.org/v1/customers/1
Let Nginx do the dirty work
https://gist.github.com/odino/6750004f735c8d08687d
example.org/customers/1
Api-Version: 1
Let Nginx do the dirty work
https://gist.github.com/odino/6750004f735c8d08687d
$req->getHeader(‘Api-Version’)
Let Nginx do the dirty work
https://gist.github.com/odino/6750004f735c8d08687d
Without polluting
routing and
controllers
“I beg to differ”
“I beg to differ”
URL, subdomain,
media type, header...
“I beg to differ”
Picking a wrong
implementation
doesn’t matter
“I beg to differ”
Picking a wrong
implementation
doesn’t matter
AT ALL.
“I beg to differ”
How it impacts the
design of your
software matters
“I beg to differ”
#NoSilverBullet
4. Be Pragmatic
/login
GET or POST?
5. Testing
cURL is your best friend
curl -X GET https://api.namshi.com/products
curl -X POST https://api.namshi.com/order -data=”{...}”
curl -X DELETE ...
curl -X PATCH ...
cURL is your best friend
cURL is your best friend
cURL is your best friend
cURL is your best friend
https://docs.python.org/2/library/json.html
httparty
https://docs.python.org/2/library/json.html
httpie
https://github.com/jkbr/httpie
smoke tests made easy
consuming/testing apis locally
https://gist.github.com/cirpo/92fa22d4c45fddf0ccfa
consuming/testing apis locally
https://gist.github.com/cirpo/c6d497c5654094904306
testing apis
Android 2.3 native browser
testing apis
testing apis
you can even
decrypt the https
responses :)
6. Design
An API is a layer on
top of your domain
Pick the layer that
is most suitable
to your needs
HTTP APIs are a
good start
REST is a DREAM
POST or PUT?
HTTP METHOD
PUT or PATCH?
HTTP METHOD
/users/johnny/tags
USER TAGS
USER TAGS
to remove a tag
PUT, PATCH or DELETE?
USER TAGS
deleting a non-existent tag
200 or 204 or 404?
http://stackoverflow.
com/questions/2342579/http-status-code-
for-update-and-delete
USER TAGS
deleting a non-existent tag
200 or 204 or 404?
http://stackoverflow.
com/questions/2342579/http-status-code-
for-update-and-delete
ON STACKOVERFLOW
THEY’RE
STILL FIGHTING
http://stackoverflow.com/questions/2342579/http-status-code-for-update-and-delete
be consistent
NAMING
/user/1
/users
/order/1
/orders
NAMING
/city/1
/cities
/curriculum/1
/curricula
NAMING
/user/1
/users
/order/1
/orders
/city/1
/cities
/curriculum/1
/curricula
NAMING
/user/1
/users
/order/1
/orders
/city/1
/cities
/curriculum/1
/curricula
not good AT ALL!
STICK WITH PLURALS
NAMING
/users/1
/users
/orders/1
/orders
/cities/1
/cities
/curricula/1
/curricula
UNIQUE RESOURCES
/users/1
/users/cirpo
/users/A323K833
UNIQUE RESOURCES
/orders/15
/orders/A323K833
UNIQUE RESOURCES
AVOID INCREMENTAL
NUMBER
(if it’s business critical)
Unstructured APIs
=
API aggregation
api.example.org/v1/latest-news
latest news +
metatags +
banners +
navigation
yada yada yada
Sort of a “wild” API
for your whole app
The client receives a
GET on /something
and will let the
API figure out
what /u/something
actually is
Orchestration Layers
https://engineering.groupon.com/2013/misc/i-tier-dismantling-the-monoliths/
“Most APIs are designed by the API
provider with the goal of maintaining
data model purity. When building an OL,
be prepared to sometimes abandon
purity in favor of optimizations and/or
performance.”
Daniel Jacobson,
director of engineering
for the Netflix API
http://www.infoq.com/presentations/API-Revolution
DOMAIN
users
orders
stock
images
DOMAIN
Think about collections
not
controllers
DOMAIN
PUT/PATCH
try to always plan for full updates
uniform responses
codebase organization
codebase organization
one bundle for each api?
one bundle for each application?
one app for each sets of api?
codebase organization
start with an app
organize bundles semantically
create shared bundles
codebase organization
BUNDLES
product
checkout
warehouse
generic
entity
7. Scalability
CACHE ALL THE THINGS!
Middlewares to the rescue!
CONNECT
https://gist.github.com/cirpo/e9ec20871e2e8d433f8d
STACK
https://gist.github.com/cirpo/11296317
STACK
https://gist.github.com/odino/b3fdacceaa0cce65fbce
Avoid sessions
Everything as a resource
http://leaphly.org/
8. We have a problem
CORS
CORS
iFrames to the rescue!
iFrames to the rescue!
domain.org
includes an
iframe from
api.domain.org
iFrames to the rescue!
then sends it
a message
through the
postMessage
API
iFrames to the rescue!
the iFrame
triggers the
ajax request
on its own
domain with
the parameters
in the message
iFrames to the rescue!
and sends
the result back
to the caller
iFrames to the rescue!
and sends
the result back
to the caller
#ghetto
CORS
xDomain,
cross-browser
without CORS
https://github.com/jpillora/xdomain
CORS
great idea, but
Jaime is alone :(
CORS
poor file upload
support
CORS
no automated tests
CORS
not a long-term
solution :’-(
CORS
xAuth, a standard
https://github.com/xauth/xauth
CORS
initially thought
to provide
a decentralized
auth service
CORS
on the centralized
xauth.org
http://hueniverse.com/2010/06/05/xauth-a-terrible-horrible-no-good-very-bad-idea/
CORS
Dead.
CORS
DEAD.
CORS
Use an API proxy
CORS
example.org/api/
(silly) browsers
(silly) browsers
if a cross-domain
request is cacheable,
the android browser
goes nuts
(silly) browsers
The request does
not include
the Origin header
(silly) browsers
Status code: 0
(silly) browsers
WHAT. THE. HECK.
http://opensourcehacker.com/2011/03/20/android-webkit-xhr-status-code-0-and-expires-
headers/
“Standards”
Don’t play with fire
Don’t play with fire
1 API, N clients
consuming it
Don’t play with fire
desktop browser,
mobile browser,
ios app, android app...
Don’t play with fire
Keep as much logic
as possible on the
server
Don’t play with fire
Less things to
implement on every
client and centralized
implementations
Don’t play with fire
make it easy for the
API clients
Don’t play with fire
POST https://api.example.com/login
200 OK
date: Thu, 01 May 2014 21:52:33 GMT
content-type: application/json
transfer-encoding: chunked
connection: close
set-cookie: login=...;
cache-control: no-cache
{
"email"=>"alessandro.nadalin@gmail.com",
"firstName"=>"Alex",
"lastName"=>"Nadalin",
"birthday"=>"21/10/1988",
}
Security matters
Security matters
[
"odino@gmail.com",
"cirpo@gmail.com",
...
]
Security matters
for(;;);[
"odino@gmail.com",
"cirpo@gmail.com",
...
]
Security matters
while(1);[
"odino@gmail.com",
"cirpo@gmail.com",
...
]
Security matters
while(1);[
"odino@gmail.com",
"cirpo@gmail.com",
...
]
http://bit.ly/why-does-google
Security matters
Avoid [...]
http://bit.ly/json-hijacking
Security matters
Use {...}
That’s all folks
github.com/cirpo
twitter.com/cirpo
cirpo.org
github.com/odino
twitter.com/_odino_
odino.org
Namshi Lead Developer Namshi VP Technology
github.com/cirpo
cirpo.org
thank you!
joind.in/11310
we are hiring!
tech.namshi.com/join-us
github.com/namshi
twitter.com/TechNamshi
tech.namshi.com
CREDITS
http://www.panoramio.com/photo/30329016
https://farm3.staticflickr.com/2199/2365883747_3a5c753719_o.jpg
http://news.buzzbuzzhome.com/2013/04/top-7-aerial-photos-cities.html
https://www.flickr.com/photos/superlekker/5917559189/sizes/l
https://www.flickr.com/photos/derekbruff/12336187505/sizes/l
https://www.flickr.com/photos/chberge/3803475294/sizes/l
https://www.flickr.com/photos/neilsingapore/8057578769
https://www.flickr.com/photos/dionnehartnett/6805481856/sizes/l
https://www.flickr.com/photos/thomashawk/186339737
https://www.flickr.com/photos/cesarastudillo/3981364314/sizes/l
https://www.flickr.com/photos/an_untrained_eye/6630719431
https://www.flickr.com/photos/30835738@N03/7936491790/sizes/l
https://www.flickr.com/photos/deboni/2959228565/sizes/l
https://www.flickr.com/photos/ghalog/6782751111/sizes/l
https://www.flickr.com/photos/timzim/177640262/sizes/o/
https://www.flickr.com/photos/innoxiuss/2824204305
https://www.flickr.com/photos/hawk59/6038847752/sizes/l
https://www.flickr.com/photos/remydwd/5487417702/sizes/l
https://www.flickr.com/photos/rammorrison/4359793666/sizes/o/
https://www.flickr.com/photos/piers_nye/2501994750/sizes/o/
https://www.flickr.com/photos/danielygo/7559750132/sizes/l
https://www.flickr.com/photos/msc72/2600035028/sizes/l
https://www.flickr.com/photos/sicilianitaliano/3609275241/sizes/l
https://www.flickr.com/photos/scottmontreal/7235110028/sizes/l
https://www.flickr.com/photos/piet_musterd/6170853224/sizes/l
https://www.flickr.com/photos/music_embassy/7137413247/sizes/l
http://upload.wikimedia.org/wikipedia/commons/9/9c/William_James_b1842c.jpg
http://theverybesttop10.files.wordpress.com/2013/08/the-world_s-top-10-things-no-person-with-a-ocd-should-see-1.
jpg
https://www.flickr.com/photos/62244271@N03/8553590682/sizes/l

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