app自动更新功能功能，无法下载问题修正

app/api/mobile/apis/upgrade.rb

@@ -15,7 +15,7 @@ module Mobile
           if attachment.nil?
             raise '未发现客户端！'
           end
-          url = Setting.host_name + "/attachments/download/" + attachment.id.to_s + "/" + attachment.filename
+          url = "http://" + Setting.host_name + "/attachments/download/" + attachment.id.to_s + "/" + attachment.filename
           {
             version: @current_version.version,
             url: url,

app/controllers/attachments_controller.rb

@@ -20,9 +20,9 @@ class AttachmentsController < ApplicationController
 
   before_filter :find_project, :only => [:show, :download, :thumbnail, :destroy, :delete_homework]#, :except => [:upload, :autocomplete]
   before_filter :file_readable, :read_authorize, :only => [:show, :thumbnail]#Modified by young
-  before_filter :delete_authorize, :only => :destroy
+  before_filter :delete_authorize, :only => [:destroy]
-  before_filter :authorize_global, :only => :upload
+  before_filter :authorize_global, :only => [:upload]
-  before_filter :authorize_attachment_download1, :only => :download
+  before_filter :authorize_attachment_download1, :only => [:download]
   #before_filter :login_without_softapplication, only: [:download]
   accept_api_auth :show, :download, :upload
   require 'iconv'