A simple HTTP-like document, with some headers on top and a body

document.rb

class Document
      
  attr_accessor :body, :headers
      
  def initialize(text)
    matches = text.match /^(?:([\s\S]+)\n\s*\n)?([\s\S]+)$/
    self.body = matches[2]
    self.headers = {}
    headers_text = matches[1] || '' 
    headers_text.split(/\n/).map { |header_text|
      if matches = header_text.match(/(.+): (.+)/) 
        self.headers[matches[1]] = matches[2]
      end
    }
  end
  
  def header(key)
    self.headers[key]
  end
      
  def to_s
    self.headers.inspect + "\n" + self.body.inspect 
  end

end

example

> doc = Document.new "name: Mario\nborn: 1981\nnemesis: Donkey Kong\n\nMario is a pretty fearless dude."
 => {"name"=>"Mario", "born"=>"1981", "nemesis"=>"Donkey Kong"}
...
"Mario is a pretty fearless dude."
 
> doc.header 'nemesis'
 => "Donkey Kong"
> doc.body
 => "Mario is a pretty fearless dude."