Примеры для статьи про Rack

demo01.rb

# encoding: utf-8

require 'pp'
require 'rack'

app = proc do |env|
  [
    200,
    { 'Content-Type' => 'text/plain' },
    [ env.pretty_inspect ]
  ]
end

Rack::Handler::WEBrick.run app

demo01.ru

require 'pp'

app = proc do |env|
  [
    200,
    { 'Content-Type' => 'text/plain' },
    [ env.pretty_inspect ]
  ]
end

run app

demo02.ru

require 'pp'

app = proc do |env|
  req = Rack::Request.new env
  [
    200,
    { 'Content-Type' => 'text/plain' },
    [ req.params.pretty_inspect ]
  ]
end

run app

demo02a.ru

require 'pp'

app = proc do |env|
  req = Rack::Request.new env
  res = Rack::Response.new
  res['Content-Type'] = 'text/plain'
  res.write req.params.pretty_inspect
  res.finish
end

run app

demo03.ru

require 'pp'
require 'json'

class Log

  def initialize app, output = $stderr
    @app = app
    @output = output
  end

  def call env
    @output.puts env.pretty_inspect
    @app.call env
  end

end

json =  proc do |env|
  [
    200,
    { 'Content-Type' => 'application/json' },
    [ JSON.generate(env) ]
  ]
end

txt = proc do |env|
  [
    200,
    { 'Content-Type' => 'text/plain' },
    [ env.pretty_inspect ]
  ]
end

app = Rack::Builder.app do

  use Log

  map '/js/' do
    run json
  end

  run txt

end

run app

demo03a.ru

require 'pp'
require 'json'

class Log

  def initialize app, output = $stderr
    @app = app
    @output = output
  end

  def call env
    @output.puts env.pretty_inspect
    @app.call env
  end

end

json =  proc do |env|
  [
    200,
    { 'Content-Type' => 'application/json' },
    [ JSON.generate(env) ]
  ]
end

txt = proc do |env|
  [
    200,
    { 'Content-Type' => 'text/plain' },
    [ env.pretty_inspect ]
  ]
end

use Log

map '/js/' do
  run json
end

run txt