Download a file in multiple pieces with download manager

[zorak]

In my application I offer multiple downloads. Some of them are really big (>>2 GB). Those files are served from the filesystem (FileCopyUtils, return null, as found in the forum).

When I use a download manager (like DownThemAll in Firefox) it only opens one channel to the server and starts the download from byte 0.
I want the download manager to start multiple downloads each with a different piece of the file.

Does anyone know how this is accomplished?

[zorak]

after searching the net i found out that handling partial downloads has to do with honouring the If-Range and etag headers.
unfortunatelly beyond that there is not much information on this subject.


does anyone of you know something more about this?