module Typhoeus::Request::Marshal

def marshal_dump

request callbacks and `hydra`, since they cannot be marshalled.
Return the important data needed to serialize this Request, except the 
def marshal_dump
  unmarshallable = %w(@on_complete @on_success @on_failure @on_progress @on_headers @on_body @hydra)
  (instance_variables - unmarshallable - unmarshallable.map(&:to_sym)).map do |name|
    [name, instance_variable_get(name)]
  end
end

def marshal_load(attributes)

Load. 
def marshal_load(attributes)
  attributes.each { |name, value| instance_variable_set(name, value) }
end