rack.ru

class MyApp
  def call(env)
    puts "hello from MyApp"
    [200, {}, ["Hello"]]
  end
end
 
class ContentType
  def initialize(app)
    @app = app
  end
  
  def call(env)
    status, headers, body = @app.call(env)
    headers["Content-Type"] = "text/html"
    [status, headers, body]
  end
end
 
class FinishSentence
  def initialize(app)
    @app = app
  end
  def call(env)
    status, headers, body = @app.call(env)
    body << " world!"
    [status, headers, [body]]
  end
  
  
#  Kirin used something like this:
#  def call(env)
#    status, headers, response = @app.call(env)
# 
#    response_body = ""
#    response.each {|part| response_body += part}
#    response_body += " World!"
# 
#    headers["Content-Length"] = response_body.length.to_s
# 
#    [status, headers, [response_body]]
#  end
end
 
use ContentType
use FinishSentence
 
run MyApp.new

# new charatcer length update missing? #