module HTTParty::ClassMethods

def format(f)

end
format :json
include HTTParty
class Foo

Must be one of the allowed formats ie: json, xml
Allows setting the format with which to parse. 
def format(f)
  raise UnsupportedFormat, "Must be one of: #{AllowedFormats.values.map { |v| v.to_s }.uniq.sort.join(', ')}" unless AllowedFormats.value?(f)
  default_options[:format] = f
end