vktest.rb

require 'uri'
require 'json'
require 'net/http'

class VK
  def initialize(access_token=nil, v='5.45')
    @access_token = access_token
    @v = v
  end

  def method_missing(name, options)
    qname = name.to_s.sub('_', '.')
    qstring = URI.encode_www_form({access_token: @access_token, v: @v}.merge(options))

    url = "https://api.vk.com/method/#{qname}.json"
    http = Net::HTTP.new('api.vk.com', 443)
    http.use_ssl = true

    request = Net::HTTP::Post.new(url)
    request.body = qstring

    response = http.request(request)
    JSON.parse(response.body)
  end
end

vk = VK.new
puts vk.users_get(user_ids: 'durov,6')