diff --git a/lib/qiniu/auth.rb b/lib/qiniu/auth.rb
index 5a2a5f3..3d028ca 100755
--- a/lib/qiniu/auth.rb
+++ b/lib/qiniu/auth.rb
@@ -3,6 +3,7 @@
 
 require 'hmac-sha1'
 require 'uri'
+require 'cgi'
 
 require 'qiniu/exceptions'
 
@@ -175,6 +176,12 @@ module Qiniu
           return "#{download_url}&token=#{dntoken}"
         end # authorize_download_url
 
+        def authorize_download_url_2(domain, key, args = EMPTY_ARGS)
+          url_encoded_key = key.split('/').map{|x| CGI::escape(x)}.join("/")
+          download_url = "http://#{domain}/#{url_encoded_key}"
+          return authorize_download_url(download_url, args)
+        end # authorize_download_url_2
+
         def generate_acctoken(url, body = '')
           ### 提取AK/SK信息
           access_key = Config.settings[:access_key]