need help！！

大神，不知道你看得懂中文不。网页翻译的可能不准，还是把中文附加上吧。
问题1：开始播放速度很慢，说是header的问题，略过后快了一点。
问题2：连接失败后没有自动重试。比如：我缓存了一部分，把网络断掉，它不会继续缓存了。
问题3：断点续传问题。我的url是可变的，但是文件却是不变的，怎么根据url和name一起缓存，而不是根据name缓存呢？
非常希望得到大神的帮助！万分感谢！
Great God, I don't know if you can read Chinese or not. The translation may be inaccurate, or append chinese.
Question 1: the playback speed is slow. It's header's problem, but it's a little faster after a while.
Problem 2: no auto retry after connection failure. For example: I cache a part and break the network. It won't continue caching.
Question 3: http problems. My URL is mutable, but the file is immutable. How do you cache it based on URL and name instead of the name cache?
Very much hope to get God's help! Thanks a million!