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Building well-defined APIs part 1: Proper HTTP
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Nikica Jokić
December 23, 2014
Technology
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89
Building well-defined APIs part 1: Proper HTTP
Short intro to Ruby port of Webmachine.
Nikica Jokić
December 23, 2014
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Transcript
Proper HTTP Building well-defined APIs, part 1: @neektza Nikica Jokić
HTTP is deceptively simple
• simple syntax, semantics up to you HTTP is deceptively
simple
• simple syntax, semantics up to you • easy to
build crappy, bad-behaving APIs HTTP is deceptively simple
• simple syntax, semantics up to you • easy to
build crappy, bad-behaving APIs • use error status codes HTTP is deceptively simple
• simple syntax, semantics up to you • easy to
build crappy, bad-behaving APIs • use error status codes • respect content-types (accept headers) HTTP is deceptively simple
• simple syntax, semantics up to you • easy to
build crappy, bad-behaving APIs • use error status codes • respect content-types (accept headers) • handle resource migration and locations HTTP is deceptively simple
A huge SVG! http://for-get.github.io/http-decision-diagram/httpdd.fsm.html
Webmachine (1/2)
• Not a framework - a toolkit Webmachine (1/2)
• Not a framework - a toolkit • Implements the
HTTP protocol as a state-machine Webmachine (1/2)
• Not a framework - a toolkit • Implements the
HTTP protocol as a state-machine Webmachine (1/2)
• Not a framework - a toolkit • Implements the
HTTP protocol as a state-machine Webmachine (1/2)
• Not a framework - a toolkit • Implements the
HTTP protocol as a state-machine • Several implementations: Webmachine (1/2)
• Not a framework - a toolkit • Implements the
HTTP protocol as a state-machine • Several implementations: • Webmachine (1st Erlang, then Ruby) Webmachine (1/2)
• Not a framework - a toolkit • Implements the
HTTP protocol as a state-machine • Several implementations: • Webmachine (1st Erlang, then Ruby) • Liberator (Clojure) Webmachine (1/2)
• Not a framework - a toolkit • Implements the
HTTP protocol as a state-machine • Several implementations: • Webmachine (1st Erlang, then Ruby) • Liberator (Clojure) • others? Webmachine (1/2)
A huge SVG! Again! http://for-get.github.io/http-decision-diagram/httpdd.fsm.html
Webmachine (2/2)
• Declarative Webmachine (2/2)
• Declarative Webmachine (2/2) get '/hello/:name' do "Hello #{params[:name]}!" end
• Declarative • Works by describing facts about the resource
Webmachine (2/2) get '/hello/:name' do "Hello #{params[:name]}!" end
• Declarative • Works by describing facts about the resource
Webmachine (2/2) get '/hello/:name' do "Hello #{params[:name]}!" end def resource_exists? resource end
• Declarative • Works by describing facts about the resource
Webmachine (2/2) get '/hello/:name' do "Hello #{params[:name]}!" end def resource_exists? resource end • known-method? / method-allowed ? • known-media-type? / media-type-available? • allowed? / authorised? • exists? / existed? • moved-temporarily? / moved-permanently?