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Nordic Ruby 2012: We don't know HTTP
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Konstantin Haase
June 15, 2012
Technology
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Nordic Ruby 2012: We don't know HTTP
Slides for the talk I gave at Nordic Ruby 2012
Konstantin Haase
June 15, 2012
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Transcript
we don’t know HTTP Konstantin Haase
@konstantinhaase (I’m sorry about that) rkh on github
Sinatra Rack, Tilt, Rubinius, ...
None
None
RFC 2616
Performance
Scalability
Security
Interoperability
HTTP has been made for this
We just don’t know.
Database Application Server
Database Application Server Application Application
Database Application Server Application Application Database Database
Database Application Server Application Application Database Database Cache
Database Application Server Application Application Database Database Cache Cache
Database Application Server Application Application Database Database Cache Cache Cache
Database Application Server Application Application Database Database Cache Cache Cache
Cache Cache Cache
Database Application Server Application Application Database Database !!! Cache !!!
!!! Cache !!! !!! Cache !!! !!! Cache !!! !!! Cache !!! !!! Cache !!!
How to scale further?
Requests Resources Representation
GET / HTTP/1.1 Accept: text/html
Optimizing Requests
Persistent Connections
Pipelining
SPDY
HTTP 2.0
Optimizing Resources
aka RFC 2616 - The Good Parts
GET, HEAD, OPTIONS, TRACE PUT, DELETE POST, PATCH
1 GET / Repeatable! :) No state change! :) Deterministic!
:)
1 2 PUT / 2 PUT / 2 Repeatable! :)
State change! :( Deterministic! :)
1 DELETE / DELETE / Repeatable! :) State change! :(
Deterministic! :)
1 2 PATCH / +1 3 PATCH / +1 Not
repeatable! :( State change! :( Deterministic! :)
Not repeatable! :( State change! :( Non-deterministic! :( 1 ?
POST / ...
Safe: Idempotent: PATCH: POST: :) :) :) :) :( :)
:( :( :) :( :( :(
worst case PATCH = Lock on document + PUT
worst case POST = Lock on system + PUT
Resources Renderer Business Logic Business Data optional
Before Request + Business Logic + DB Access + Rendering
After Request + DB Access + Rendering
Performance
Resources Renderer Business Logic Business Data Renderer
Resources Renderer Business Logic Business Data Renderer Business Logic
Resources Renderer Business Logic Business Data Renderer Business Logic Resources
Resources Renderer Business Logic Business Data Renderer Business Logic Resources
Business Data
Server Box A Box B GET GET
Server Box A Box B PUT PUT PUT
Server Box A Box B PATCH PATCH PUT + Lock
Server POST ? :(
Browser support? :( <a href=”/” method=”delete”> <form method=”patch”>
Locking? HTTP?
Locking :(
Optimistic Locking :)
PATCH / If-Match: “XYZ”
PUT / If-Non-Match: *
DELETE / If-Match: *
PATCH / If-Unmodified- Since: ...
Browser support? :( <form if-match=”...”> <form if-unmodified-since=”...”>
Scalability
Example Attack JSON CSRF
// https://foo/secrets.json [“chunky”, “bacon”]
<script ! src=”https://foo/secrets.json” ! type=”text/javascript” />
Browser support? :( <script ! src=”https://foo/secrets.json” ! type=”text/javascript” /> GET
/secrets.json Accept: */*
var captured = []; var oldArray = Array; function Array()
{ var obj = this, id = 0, capture = function(value) { obj.__defineSetter__(id++, capture); if (value) captured.push(value); }; capture(); }
Old Architecture Rerun Request Without Session Side-effects? Server load? :(
New Architecture Don’t Authenticate with Session Yay!
Security
Also, Hypermedia! ;)
Interoperability
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