gistfile1.rb

#!/usr/bin/env ruby

require 'net/http'
require 'json'

module ResponseMethods
  def json_body
    JSON.parse(self.body)
  end
end

class Requests
  def self.request(method, url)
    uri = URI.parse(url)
    http = Net::HTTP.new(uri.host, uri.port)
    klass = Net::HTTP.const_get(method)
    request = klass.new(uri.request_uri)
    yield request if block_given?
    response = http.request(request)
    response.extend ResponseMethods
    response
  end

  def self.get(url)
    request(:Get, url)
  end

  def self.post(url, params = {})
    request(:Post, url) do |req|
      req.set_form_data(params)
    end
  end
end

response = Requests.get('http://jsonip.com/')
p response.json_body['ip