Demonstration of header caching bug in HyperResource

Gemfile

gem 'sinatra'
gem 'hyperresource'

repro.rb

require 'hyperresource'

hr_bar = HyperResource.new(root: 'http://localhost:4000', headers: { 'FOO' => 'bar' })
hr_bar.name
# => "bar"

hr_notbar = HyperResource.new(root: 'http://localhost:4000')
hr_notbar.name
# => "bar"
hr_notbar.get.name
# => "notbar"

server.rb

require 'sinatra'
require 'json'

set :port, 4000

before do
  content_type 'application/hal+json'
end

get '/' do
  if request.env['HTTP_FOO'] == 'bar'
    name = 'bar'
  else
    name = 'notbar'
  end
  {
    name: name,
    _links: {
      self: { href: 'http://localhost:4000/' },
    }
  }.to_json
end