Android - Header content-length equal -1

Question

I'm downloading a file in my android app and I want to display a progressbar. I need to know the total file size by using this method : here . The problem is that I always get -1 despite the fact that it's set on the server and I can see it from my computer.

This is the code :

URL url = new URL(fileUrl);
URLConnection ucon = url.openConnection();
ucon.connect();
int length = ucon.getContentLength();

What is the problem ?

Answer 1

这与Android无关，很可能不是从服务器发送的。请使用任何嗅探工具以确保内容长度标头存在。