Ruby rack

Apr 5, 2020

Rack 是 ruby 世界中提供 web 框架 (ruby on rails, sinatra) 和 web 伺服器 (webrick, puma, unicorn) 之間介面的 gem。

The Rack interface

Respond to call method, which accepts a single argument called env, and returns an array with three elements: status, headers, body.

The rack hello world - class version

require 'rack'

class HelloWorld
  def call(env)
    [200, {'Content-Type' => 'text/plain'}, ['Hello World']]
  end
end

Rack::Handler::WEBrick.run HelloWorld.new

# open http://localhost:8080
# Hello World

The rack hello world - lambda version

require 'rack'

app = -> (env) { [200, {'Content-Type' => 'text/plain'}, ['Hello World']] }

Rack::Handler::WEBrick.run app

# open http://localhost:8080
# Hello World

參考文獻

ruby

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