使用cocos-js3.7 做的热更新。
参考的URL是 https://github.com/faint2death/cocos2d-js/blob/master/assetsmanager.md
现在的问题是，同一套代码在IOS下已经成功更新了图片资源，但是在安卓下会报错:
08-17 18:47:37.170: D/cocos2d-x debug info(28568): JS: storagePath is /data/data/com.ok.androidtest/files/
08-17 18:47:37.170: D/cocos2d-x debug info(28568): JS: local res/project.manifest file is loaded
08-17 18:47:37.210: D/cocos2d-x debug info(28568): JS: 100%
08-17 18:47:37.260: D/cocos2d-x debug info(28568): JS: 100%
08-17 18:47:37.270: D/cocos2d-x debug info(28568): JS: 0%
08-17 18:47:37.270: D/cocos2d-x debug info(28568): JS: Start to update 1 files from remote package.
08-17 18:47:37.300: D/cocos2d-x debug info(28568): JS: 更新过程中出错Asset update error: , Can not get content size of file (http://xxxx/res/Images/update1.zip) : Request header failed
08-17 18:47:37.480: D/cocos2d-x debug info(28568): JS: AssetsManager::onExit
请问大概是什么原因导致的