How LWP useragent gets file in multiple parts

hai people,
i have been trying to understand the http::responce
when i got a file to download .. i know it will download in a single 
stream....
i need to find to know that weather it can be done in multiple ways in 
perl to download the file .....
i know curl ,aria2 and others have that capability i need to know in 
perl ...
thank you 
Perl@work