Sinatra app for loading YAML serialized HTTP responses (404s 500s 302s etc)

Rakefile

# Usage:
# rake response:capture url=http://google.com/ filename=google_200
# rake response:capture url=http://google.com/404 filename=google_404

require 'rubygems'
require 'net/http'
require 'uri'


namespace :response do
  desc "Response management"
  task :capture, :url, :filename do |t,args|
    filepath = '../responses/'
    filename = args.filename
    filename += '.http' unless filename =~ /\.http$/
    puts "Capturing '#{args.url}'"
    puts "Will save as '#{filepath}#{filename}'"
    uri = URI.parse(args.url)
    proxy = Net::HTTP::Proxy('www-cache.reith.bbc.co.uk',80)
    proxy.start(uri.host) do |h|
      req = Net::HTTP::Get.new(uri.path)
      response = h.request(req)
      serial = response.to_yaml
      file = File.new("#{filepath}#{filename}","w")
      file.write(serial)
      file.close
      puts "Saved #{filepath}#{filename}"
      response
    end
  end
end

responsive.rb

# Sinatra app for loading serialized
# YAML responses from a directory mapped
# to a base URL.
# 
# Useful for faking service call responses
# where you can swap out the text files
# without restarting Sinatra



require 'rubygems'
require 'sinatra'

get %r{(.*)} do
  path = params[:captures].first
  path = 'index' unless path != '/'
  response = YAML.load_file("responses/#{path}")
  status response.code
  headers response.instance_variable_get('@header')
  response.instance_variable_get('@body')
end