diff --git a/lib/qiniu.rb b/lib/qiniu.rb
index 337b78a..e7a36e5 100755
--- a/lib/qiniu.rb
+++ b/lib/qiniu.rb
@@ -64,7 +64,7 @@ module Qiniu
         opts[:enable_resumable_upload] = true unless opts.has_key?(:enable_resumable_upload)
 
         if opts[:enable_resumable_upload] && File::size(source_file) > Config.settings[:block_size]
-          code, data = Storage.upload_with_token(opts[:uptoken],
+          code, data, raw_headers = Storage.upload_with_token(opts[:uptoken],
                                             opts[:file],
                                             opts[:bucket],
                                             opts[:key],
@@ -74,7 +74,7 @@ module Qiniu
                                             opts[:callback_params],
                                             opts[:rotate])
         else
-          code, data = Storage.upload_with_token(opts[:uptoken],
+          code, data, raw_headers = Storage.upload_with_token(opts[:uptoken],
                                             opts[:file],
                                             opts[:bucket],
                                             opts[:key],
diff --git a/lib/qiniu/auth.rb b/lib/qiniu/auth.rb
index 5b2e531..7df31b6 100755
--- a/lib/qiniu/auth.rb
+++ b/lib/qiniu/auth.rb
@@ -132,22 +132,6 @@ module Qiniu
       end # class PutPolicy
 
       class << self
-
-        include Utils
-
-        def call_with_signature(url, data, retry_times = 0, options = {})
-          return Utils.http_request(
-            url,
-            data,
-            options.merge({:qbox_signature_token => generate_acctoken(url, data)})
-          )
-        end # call_with_signature
-
-        def request(url, data = nil, options = {})
-          code, data, raw_headers = Auth.call_with_signature(url, data, 0, options)
-          [code, data, raw_headers]
-        end # request
-
         EMPTY_ARGS = {}
 
         ### 生成下载授权URL
diff --git a/lib/qiniu/http.rb b/lib/qiniu/http.rb
new file mode 100755
index 0000000..a03ff82
--- /dev/null
+++ b/lib/qiniu/http.rb
@@ -0,0 +1,129 @@
+# -*- encoding: utf-8 -*-
+# vim: sw=2 ts=2
+
+module Qiniu
+  module HTTP
+
+    class << self
+      public
+      def is_response_ok?(http_code)
+          return 200 <= http_code && http_code <= 299
+      end # is_response_ok?
+
+      def generate_query_string(params)
+        if params.is_a?(Hash)
+          total_param = params.map { |key, value| %Q(#{CGI.escape(key.to_s)}=#{CGI.escape(value.to_s).gsub('+', '%20')}) }
+          return total_param.join("&")
+        end
+
+        return params
+      end # generate_query_string
+
+      def get (url, opts = {})
+        ### 配置请求Header
+        req_headers = {
+          :accept     => '*/*',
+          :user_agent => Config.settings[:user_agent]
+        }
+
+        # 优先使用外部Header，覆盖任何特定Header
+        if opts[:headers].is_a?(Hash) then
+          req_headers.merge!(opts[:headers])
+        end
+
+        ### 发送请求
+        response = RestClient.get(url, req_headers)
+        return response.code.to_i, response.body, response.raw_headers
+      rescue => e
+        Log.logger.warn "#{e.message} => Qiniu::HTTP.get('#{url}')"
+        return nil, nil, nil
+      end # get
+
+      API_RESULT_MIMETYPE = 'application/json'
+
+      def api_get (url, opts = {})
+        ### 配置请求Header
+        headers = {
+          :accept => API_RESULT_MIMETYPE
+        }
+
+        # 将特定Header混入外部Header中
+        if opts[:headers].is_a?(Hash) then
+          opts[:headers] = opts[:headers].dup.merge!(headers)
+        else
+          opts[:headers] = headers
+        end
+
+        ### 发送请求，然后转换返回值
+        resp_code, resp_body, resp_headers = get(url, opts)
+        if resp_code.nil? then
+          return 0, {}, {}
+        end
+
+        content_type = resp_headers["content-type"][0]
+        if !content_type.nil? && content_type == API_RESULT_MIMETYPE then
+          # 如果是JSON格式，则反序列化
+          resp_body = Utils.safe_json_parse(resp_body)
+        end
+
+        return resp_code, resp_body, resp_headers
+      end # api_get
+
+      def post (url, req_body = nil, opts = {})
+        ### 配置请求Header
+        req_headers = {
+          :accept     => '*/*',
+          :user_agent => Config.settings[:user_agent]
+        }
+
+        # 优先使用外部Header，覆盖任何特定Header
+        if opts[:headers].is_a?(Hash) then
+          req_headers.merge!(opts[:headers])
+        end
+
+        ### 发送请求
+        response = RestClient.post(url, req_body, req_headers)
+        return response.code.to_i, response.body, response.raw_headers
+      rescue => e
+        Log.logger.warn "#{e.message} => Qiniu::HTTP.post('#{url}')"
+        return nil, nil, nil
+      end # post
+
+      def api_post (url, req_body = nil, opts = {})
+        ### 配置请求Header
+        headers = {
+          :accept => API_RESULT_MIMETYPE
+        }
+
+        # 将特定Header混入外部Header中
+        if opts[:headers].is_a?(Hash) then
+          opts[:headers] = opts[:headers].dup.merge!(headers)
+        else
+          opts[:headers] = headers
+        end
+
+        ### 发送请求，然后转换返回值
+        resp_code, resp_body, resp_headers = post(url, req_body, opts)
+        if resp_code.nil? then
+          return 0, {}, {}
+        end
+
+        content_type = resp_headers["content-type"][0]
+        if !content_type.nil? && content_type == API_RESULT_MIMETYPE then
+          # 如果是JSON格式，则反序列化
+          resp_body = Utils.safe_json_parse(resp_body)
+        end
+
+        return resp_code, resp_body, resp_headers
+      end # api_post
+
+      def management_post (url, body = '')
+        ### 授权并执行管理操作
+        return HTTP.api_post(url, body, {
+          :headers => { 'Authorization' => 'QBox ' + Auth.generate_acctoken(url, body) }
+        })
+      end # management_post
+    end # class << self
+
+  end # module HTTP
+end # module Qiniu
diff --git a/lib/qiniu/image.rb b/lib/qiniu/image.rb
index 146dcc4..cdd997c 100755
--- a/lib/qiniu/image.rb
+++ b/lib/qiniu/image.rb
@@ -7,11 +7,11 @@ module Qiniu
         include Utils
 
         def info(url)
-          Utils.http_request url + '?imageInfo', nil, {:method => :get}
+          return HTTP.api_get(url + '?imageInfo')
         end # info
 
         def exif(url)
-          Utils.http_request url + '?exif', nil, {:method => :get}
+          return HTTP.api_get(url + '?exif')
         end # exif
 
         def mogrify_preview_url(source_image_url, options)
diff --git a/lib/qiniu/management.rb b/lib/qiniu/management.rb
index 6797da2..911d2e1 100755
--- a/lib/qiniu/management.rb
+++ b/lib/qiniu/management.rb
@@ -1,31 +1,38 @@
 # -*- encoding: utf-8 -*-
+# vim: sw=2 ts=2
+
+require 'qiniu/http'
 
 module Qiniu
     module Storage
       class << self
         include Utils
 
+        public
         def buckets
-          Auth.request Config.settings[:rs_host] + '/buckets'
+          url = Config.settings[:rs_host] + '/buckets'
+          return HTTP.management_post(url)
         end # buckets
 
         PRIVATE_BUCKET = 0
         PUBLIC_BUCKET  = 1
 
         def mkbucket(bucket_name, is_public = PUBLIC_BUCKET)
-          Auth.request Config.settings[:rs_host] + '/mkbucket2/' + bucket_name + '/public/' + is_public.to_s
+          url = Config.settings[:rs_host] + '/mkbucket2/' + bucket_name + '/public/' + is_public.to_s
+          return HTTP.management_post(url)
         end # mkbucket
 
         def make_a_private_bucket(bucket_name)
-            return mkbucket(bucket_name, PRIVATE_BUCKET)
+          return mkbucket(bucket_name, PRIVATE_BUCKET)
         end # make_a_private_bucket
 
         def make_a_public_bucket(bucket_name)
-            return mkbucket(bucket_name, PUBLIC_BUCKET)
+          return mkbucket(bucket_name, PUBLIC_BUCKET)
         end # make_a_public_bucket
 
         def stat(bucket, key)
-          Auth.request Config.settings[:rs_host] + '/stat/' + encode_entry_uri(bucket, key)
+          url = Config.settings[:rs_host] + '/stat/' + encode_entry_uri(bucket, key)
+          return HTTP.management_post(url)
         end # stat
 
         def get(bucket, key, save_as = nil, expires_in = nil, version = nil)
@@ -33,35 +40,41 @@ module Qiniu
           url += '/base/' + version unless version.nil?
           url += '/attName/' + Utils.urlsafe_base64_encode(save_as) unless save_as.nil?
           url += '/expires/' + expires_in.to_s if !expires_in.nil? && expires_in > 0
-          Auth.request url
+          return HTTP.management_post(url)
         end # get
 
         def copy(source_bucket, source_key, target_bucket, target_key)
           uri = _generate_cp_or_mv_opstr('copy', source_bucket, source_key, target_bucket, target_key)
-          Auth.request Config.settings[:rs_host] + uri
+          url = Config.settings[:rs_host] + uri
+          return HTTP.management_post(url)
         end # copy
 
         def move(source_bucket, source_key, target_bucket, target_key)
           uri = _generate_cp_or_mv_opstr('move', source_bucket, source_key, target_bucket, target_key)
-          Auth.request Config.settings[:rs_host] + uri
+          url = Config.settings[:rs_host] + uri
+          return HTTP.management_post(url)
         end # move
 
         def delete(bucket, key)
-          Auth.request Config.settings[:rs_host] + '/delete/' + encode_entry_uri(bucket, key)
+          url = Config.settings[:rs_host] + '/delete/' + encode_entry_uri(bucket, key)
+          return HTTP.management_post(url)
         end # delete
 
         def publish(domain, bucket)
           encoded_domain = Utils.urlsafe_base64_encode(domain)
-          Auth.request Config.settings[:rs_host] + "/publish/#{encoded_domain}/from/#{bucket}"
+          url = Config.settings[:rs_host] + "/publish/#{encoded_domain}/from/#{bucket}"
+          return HTTP.management_post(url)
         end # publish
 
         def unpublish(domain)
           encoded_domain = Utils.urlsafe_base64_encode(domain)
-          Auth.request Config.settings[:rs_host] + "/unpublish/#{encoded_domain}"
+          url = Config.settings[:rs_host] + "/unpublish/#{encoded_domain}"
+          return HTTP.management_post(url)
         end # unpublish
 
         def drop(bucket)
-          Auth.request Config.settings[:rs_host] + "/drop/#{bucket}"
+          url = Config.settings[:rs_host] + "/drop/#{bucket}"
+          return HTTP.management_post(url)
         end # drop
 
         def batch(command, bucket, keys)
@@ -70,7 +83,8 @@ module Qiniu
             encoded_uri = encode_entry_uri(bucket, key)
             execs << "op=/#{command}/#{encoded_uri}"
           end
-          Auth.request Config.settings[:rs_host] + "/batch", execs.join("&"), {:mime => "application/x-www-form-urlencoded" }
+          url = Config.settings[:rs_host] + "/batch"
+          return HTTP.management_post(url, execs.join("&"))
         end # batch
 
         def batch_get(bucket, keys)
@@ -97,7 +111,7 @@ module Qiniu
           encoded_uri = encode_entry_uri(bucket, key)
           save_as_string = '/save-as/' + encoded_uri
           new_url = source_url + '?' + op_params_string + save_as_string
-          Auth.request new_url
+          return HTTP.management_post(new_url)
         end # save_as
 
         def image_mogrify_save_as(bucket, key, source_image_url, options)
@@ -118,7 +132,8 @@ module Qiniu
           op_args.each do |e| 
             execs << 'op=' + _generate_cp_or_mv_opstr(command, e[0], e[1], e[2], e[3]) if e.size == 4
           end 
-          Auth.request Config.settings[:rs_host] + "/batch", execs.join("&"), {:mime => "application/x-www-form-urlencoded" }
+          url = Config.settings[:rs_host] + "/batch"
+          return HTTP.management_post(url, execs.join("&"))
         end # _batch_cp_or_mv
       end
     end # module Storage
diff --git a/lib/qiniu/misc.rb b/lib/qiniu/misc.rb
index d9d61b9..6359bfa 100755
--- a/lib/qiniu/misc.rb
+++ b/lib/qiniu/misc.rb
@@ -3,33 +3,31 @@
 module Qiniu
     module Misc
       class << self
-        include Utils
-
         def set_protected(bucket, protected_mode)
-          host = Config.settings[:pub_host]
-          Auth.request %Q(#{host}/accessMode/#{bucket}/mode/#{protected_mode})
-        end
+          url = Config.settings[:pub_host] + %Q(/accessMode/#{bucket}/mode/#{protected_mode})
+          return HTTP.management_post(url)
+        end # set_protected
 
         def set_separator(bucket, separator)
-          host = Config.settings[:pub_host]
           encoded_separator = Utils.urlsafe_base64_encode(separator)
-          Auth.request %Q(#{host}/separator/#{bucket}/sep/#{encoded_separator})
-        end
+          url = Config.settings[:pub_host] + %Q(/separator/#{bucket}/sep/#{encoded_separator})
+          return HTTP.management_post(url)
+        end # set_separator
 
         def set_style(bucket, name, style)
-          host = Config.settings[:pub_host]
           encoded_name = Utils.urlsafe_base64_encode(name)
           encoded_style = Utils.urlsafe_base64_encode(style)
-          Auth.request %Q(#{host}/style/#{bucket}/name/#{encoded_name}/style/#{encoded_style})
-        end
+          url = Config.settings[:pub_host] + %Q(/style/#{bucket}/name/#{encoded_name}/style/#{encoded_style})
+          return HTTP.management_post(url)
+        end # set_style
 
         def unset_style(bucket, name)
-          host = Config.settings[:pub_host]
           encoded_name = Utils.urlsafe_base64_encode(name)
-          Auth.request %Q(#{host}/unstyle/#{bucket}/name/#{encoded_name})
-        end
+          url = Config.settings[:pub_host] + %Q(/unstyle/#{bucket}/name/#{encoded_name})
+          return HTTP.management_post(url)
+        end # unset_style
+      end # class << self
 
-      end
     end # module Misc
 end # module Qiniu
 
diff --git a/lib/qiniu/resumable_upload.rb b/lib/qiniu/resumable_upload.rb
index 633fff6..1c20946 100755
--- a/lib/qiniu/resumable_upload.rb
+++ b/lib/qiniu/resumable_upload.rb
@@ -97,13 +97,17 @@ module Qiniu
 
         def _call_binary_with_token(uptoken, url, data, content_type = nil, retry_times = 0)
           options = {
-              :method => :post,
-              :content_type => 'application/octet-stream',
-              :upload_signature_token => uptoken
+              :headers => {
+                  :content_type   => 'application/octet-stream',
+                  'Authorization' => 'UpToken ' + uptoken
+              }
           }
-          options[:content_type] = content_type if !content_type.nil? && !content_type.empty?
-          code, data = http_request url, data, options
-          unless Utils.is_response_ok?(code)
+          if !content_type.nil? && !content_type.empty? then
+              options[:headers][:content_type] = content_type 
+          end
+
+          code, data = HTTP.api_post(url, data, options)
+          unless HTTP.is_response_ok?(code)
               retry_times += 1
               if Config.settings[:auto_reconnect] && retry_times < Config.settings[:max_retry_times]
                   return _call_binary_with_token(uptoken, url, data, options[:content_type], retry_times)
@@ -148,7 +152,7 @@ module Qiniu
                     end
                     code, data = _mkblock(uptoken, block_size, body)
                     body_crc32 = Zlib.crc32(body)
-                    if Utils.is_response_ok?(code) && data["crc32"] == body_crc32
+                    if HTTP.is_response_ok?(code) && data["crc32"] == body_crc32
                         progress[:ctx] = data["ctx"]
                         progress[:offset] = body_length
                         progress[:restsize] = block_size - body_length
@@ -179,7 +183,7 @@ module Qiniu
                     end
                     code, data = _putblock(progress[:host], uptoken, progress[:ctx], progress[:offset], body)
                     body_crc32 = Zlib.crc32(body)
-                    if Utils.is_response_ok?(code) && data["crc32"] == body_crc32
+                    if HTTP.is_response_ok?(code) && data["crc32"] == body_crc32
                         progress[:ctx] = data["ctx"]
                         progress[:offset] += body_length
                         progress[:restsize] -= body_length
@@ -228,7 +232,7 @@ module Qiniu
                     #code, data = _resumable_put_block(uptoken, fh, block_index, block_size, Config.settings[:chunk_size], progresses[block_index], Config.settings[:max_retry_times], chunk_notifier)
                     # Put the whole block as a chunk
                     code, data = _resumable_put_block(uptoken, fh, block_index, block_size, block_size, progresses[block_index], Config.settings[:max_retry_times], chunk_notifier)
-                    if Utils.is_response_ok?(code)
+                    if HTTP.is_response_ok?(code)
                         #checksums[block_index] = data["checksum"]
                         checksums[block_index] = data["ctx"]
                         if !block_notifier.nil? && block_notifier.respond_to?("notify")
@@ -254,7 +258,7 @@ module Qiniu
           path += '/mimeType/' + Utils.urlsafe_base64_encode(mime_type) if !mime_type.nil? && !mime_type.empty?
           path += '/meta/' + Utils.urlsafe_base64_encode(custom_meta) if !custom_meta.nil? && !custom_meta.empty?
           path += '/customer/' + customer if !customer.nil? && !customer.empty?
-          callback_query_string = Utils.generate_query_string(callback_params) if !callback_params.nil? && !callback_params.empty?
+          callback_query_string = HTTP.generate_query_string(callback_params) if !callback_params.nil? && !callback_params.empty?
           path += '/params/' + Utils.urlsafe_base64_encode(callback_query_string) if !callback_query_string.nil? && !callback_query_string.empty?
           path += '/rotate/' + rotate if !rotate.nil? && rotate.to_i >= 0
           url = uphost + path
@@ -289,13 +293,13 @@ module Qiniu
 
           code, data = _resumable_put(uptoken, fh, checksums, progresses, block_notifier, chunk_notifier)
 
-          if Utils.is_response_ok?(code)
+          if HTTP.is_response_ok?(code)
             uphost = data["host"]
             entry_uri = bucket + ':' + key
             code, data = _mkfile(uphost, uptoken, entry_uri, fsize, checksums, mime_type, custom_meta, customer, callback_params, rotate)
           end
 
-          if Utils.is_response_ok?(code)
+          if HTTP.is_response_ok?(code)
             Utils.debug "File #{fh.path} {size: #{fsize}} successfully uploaded."
           end
 
diff --git a/lib/qiniu/tokens/qbox_token.rb b/lib/qiniu/tokens/qbox_token.rb
index bca67c2..186aaa9 100755
--- a/lib/qiniu/tokens/qbox_token.rb
+++ b/lib/qiniu/tokens/qbox_token.rb
@@ -23,7 +23,7 @@ module Qiniu
           signature += '?' + query_string if !query_string.nil? && !query_string.empty?
           signature += "\n"
           if @params.is_a?(Hash)
-              params_string = Utils.generate_query_string(@params)
+              params_string = HTTP.generate_query_string(@params)
               signature += params_string
           end
           signature
diff --git a/lib/qiniu/upload.rb b/lib/qiniu/upload.rb
index ecb3743..4e76eec 100755
--- a/lib/qiniu/upload.rb
+++ b/lib/qiniu/upload.rb
@@ -28,10 +28,20 @@ module Qiniu
         if callback_params.nil?
           callback_params = {:bucket => bucket, :key => key, :mime_type => mime_type}
         end
-        callback_query_string = Utils.generate_query_string(callback_params)
-        url = Config.settings[:up_host] + '/upload'
+        callback_query_string = HTTP.generate_query_string(callback_params)
 
-        Utils.upload_multipart_data(url, local_file, action_params, callback_query_string, uptoken)
+        url = Config.settings[:up_host] + '/upload'
+        post_data = {
+          :params     => callback_query_string,
+          :action     => action_params,
+          :file       => File.new(local_file, 'rb'),
+          :multipart  => true
+        }
+        if !uptoken.nil? then
+          post_data[:auth] = uptoken unless uptoken.nil?
+        end
+
+        return HTTP.api_post(url, post_data)
       end # upload_with_token
 
       def upload_with_token_2(uptoken,
@@ -59,7 +69,7 @@ module Qiniu
         end
 
         ### 发送请求
-        Utils.http_request url, post_data
+        HTTP.api_post(url, post_data)
       end # upload_with_token_2
 
       ### 授权举例
diff --git a/lib/qiniu/utils.rb b/lib/qiniu/utils.rb
index 4b1f024..ad92f1b 100755
--- a/lib/qiniu/utils.rb
+++ b/lib/qiniu/utils.rb
@@ -31,20 +31,13 @@ module Qiniu
         {}
       end
 
-      def is_response_ok?(status_code)
-          status_code/100 == 2
-      end
-
-      def response_error(status_code, errmsg)
-          [status_code, {"error" => errmsg}]
-      end
-
       def debug(msg)
           if Config.settings[:enable_debug]
               Log.logger.debug(msg)
           end
       end
 
+      ### 已过时，仅作为兼容接口保留
       def send_request_with url, data = nil, options = {}
         options[:method] = Config.settings[:method] unless options[:method]
         options[:content_type] = Config.settings[:content_type] unless options[:content_type]
@@ -69,7 +62,7 @@ module Qiniu
           response = RestClient.post(url, data, header_options)
         end
         code = response.respond_to?(:code) ? response.code.to_i : 0
-        unless is_response_ok?(code)
+        unless HTTP.is_response_ok?(code)
           raise RequestFailed.new("Request Failed", response)
         else
           data = {}
@@ -80,6 +73,7 @@ module Qiniu
         [code, data, raw_headers]
       end # send_request_with
 
+      ### 已过时，仅作为兼容接口保留
       def http_request url, data = nil, options = {}
         retry_times = 0
         begin
@@ -107,23 +101,6 @@ module Qiniu
         end
       end
 
-      def upload_multipart_data(url, filepath, action_string, callback_query_string = '', uptoken = nil)
-          post_data = {
-            :params => callback_query_string,
-            :action => action_string,
-            :file => File.new(filepath, 'rb'),
-            :multipart => true
-          }
-          post_data[:auth] = uptoken unless uptoken.nil?
-          http_request url, post_data
-      end
-
-      def generate_query_string(params)
-        return params if params.is_a?(String)
-        total_param = params.map { |key, value| %Q(#{CGI.escape(key.to_s)}=#{CGI.escape(value.to_s).gsub('+', '%20')}) }
-        total_param.join("&")
-      end
-
       def crc32checksum(filepath)
         File.open(filepath, "rb") { |f| Zlib.crc32 f.read }
       end