You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: uploadable_io.rb
    path of file: ./repos/koala/lib/koala/http_service
    
    the code of the file until where you have to start completion: require "tempfile"

module Koala
  module HTTPService
    class UploadableIO
      attr_reader :io_or_path, :content_type, :filename

      def initialize
    
      def use_mime_module(filename)
        # if the user has installed mime/types, we can use that
        # if not, rescue and return nil
        begin
          type = MIME::Types.type_for(filename).first
          type ? type.to_s : nil
        rescue
          nil
        end