class HTTParty::HeadersProcessor

def process_dynamic_headers
  options[:headers].each_with_object({}) do |header, processed_headers|
    key, value = header
    processed_headers[key] = if value.respond_to?(:call)
                               value.arity == 0 ? value.call : value.call(options)
                             else
                               value
                             end
  end
end