diff --git a/lib/qiniu/rs.rb b/lib/qiniu/rs.rb
index ae5e433..7fe6f9f 100755
--- a/lib/qiniu/rs.rb
+++ b/lib/qiniu/rs.rb
@@ -31,8 +31,15 @@ module Qiniu
         code == StatusOK ? data["url"] : false
       end
 
-      def upload(url, local_file, bucket = '', key = '', mime_type = '', custom_meta = '', callback_params = {})
-        code, data = IO.put_file(url, local_file, bucket, key, mime_type, custom_meta, callback_params)
+      def upload opts = {}
+        code, data = IO.put_file(opts[:url],
+                                 opts[:file],
+                                 opts[:bucket],
+                                 opts[:key],
+                                 opts[:mime_type],
+                                 opts[:note],
+                                 opts[:callback_params],
+                                 opts[:enable_crc32_check])
         code == StatusOK
       end
 
diff --git a/lib/qiniu/rs/config.rb b/lib/qiniu/rs/config.rb
index 077ab0d..7b1f6e4 100755
--- a/lib/qiniu/rs/config.rb
+++ b/lib/qiniu/rs/config.rb
@@ -21,9 +21,9 @@ module Qiniu
           :content_type    => 'application/x-www-form-urlencoded',
           :auth_url        => "https://acc.qbox.me/oauth2/token",
           :rs_host         => "http://rs.qbox.me:10100",
-          :io_host         => "http://io.qbox.me",
-          :client_id       => "<YOUR_APP_CLIENT_ID>",
-          :client_secret   => "<YOUR_APP_CLIENT_SECRET>",
+          :io_host         => "http://iovip.qbox.me",
+          :client_id       => "",
+          :client_secret   => "",
           :auto_reconnect  => true,
           :max_retry_times => 5
         }
diff --git a/lib/qiniu/rs/io.rb b/lib/qiniu/rs/io.rb
index 9790979..8e2768a 100755
--- a/lib/qiniu/rs/io.rb
+++ b/lib/qiniu/rs/io.rb
@@ -20,17 +20,18 @@ module Qiniu
           Auth.request(url)
         end
 
-        def put_file(url, local_file, bucket = '', key = '', mime_type = '', custom_meta = '', callback_params = '')
+        def put_file(url, local_file, bucket = nil, key = nil, mime_type = nil, custom_meta = nil, callback_params = nil, enable_crc32_check = false)
           raise NoSuchFileError unless File.exist?(local_file)
-          key = Digest::SHA1.hexdigest(local_file + Time.now.to_s) if key.empty?
+          key = Digest::SHA1.hexdigest(local_file + Time.now.to_s) if key.nil?
           entry_uri = bucket + ':' + key
-          if mime_type.empty?
+          if mime_type.nil?
             mime = MIME::Types.type_for local_file
             mime_type = mime.empty? ? 'application/octet-stream' : mime[0].content_type
           end
           action_params = '/rs-put/' + Utils.urlsafe_base64_encode(entry_uri) + '/mimeType/' + Utils.urlsafe_base64_encode(mime_type)
-          action_params += '/meta/' + Utils.urlsafe_base64_encode(custom_meta) unless custom_meta.empty?
-          callback_params = {:bucket => bucket, :key => key, :mime_type => mime_type} if callback_params.empty?
+          action_params += '/meta/' + Utils.urlsafe_base64_encode(custom_meta) unless custom_meta.nil?
+          action_params += '/crc32/' + Utils.crc32checksum(local_file).to_s if enable_crc32_check
+          callback_params = {:bucket => bucket, :key => key, :mime_type => mime_type} if callback_params.nil?
           callback_query_string = Utils.generate_query_string(callback_params)
           Utils.upload_multipart_data(url, local_file, action_params, callback_query_string)
         end
diff --git a/lib/qiniu/rs/utils.rb b/lib/qiniu/rs/utils.rb
index bc58aad..0009cde 100755
--- a/lib/qiniu/rs/utils.rb
+++ b/lib/qiniu/rs/utils.rb
@@ -2,6 +2,7 @@
 
 require 'uri'
 require 'json'
+require 'zlib'
 require 'base64'
 require 'rest_client'
 require 'qiniu/rs/exceptions'
@@ -119,6 +120,10 @@ module Qiniu
         URI.escape(total_param.join("&"))
       end
 
+      def crc32checksum(filepath)
+        File.open(filepath, "rb") { |f| Zlib.crc32 f.read }
+      end
+
     end
   end
 end
diff --git a/lib/qiniu/rs/version.rb b/lib/qiniu/rs/version.rb
index c39c329..4a7eaf0 100755
--- a/lib/qiniu/rs/version.rb
+++ b/lib/qiniu/rs/version.rb
@@ -2,6 +2,6 @@
 
 module Qiniu
   module RS
-    VERSION = "1.0.4"
+    VERSION = "1.1.0"
   end
 end
diff --git a/spec/qiniu/rs_spec.rb b/spec/qiniu/rs_spec.rb
index 9ae0310..2ba7500 100755
--- a/spec/qiniu/rs_spec.rb
+++ b/spec/qiniu/rs_spec.rb
@@ -34,7 +34,11 @@ module Qiniu
         put_url.should_not be_false
         put_url.should_not be_empty
         puts put_url.inspect
-        result = Qiniu::RS.upload(put_url, __FILE__, @bucket, @key)
+        result = Qiniu::RS.upload :url => put_url,
+                                  :file =>  __FILE__,
+                                  :bucket => @bucket,
+                                  :key => @key,
+                                  :enable_crc32_check => true
         result.should be_true
       end
     end