Proxy with Multi-Thread Connections?

[gsvnet]

Does nginx have the ability to open multiple threads in a proxy
situation when connecting to the origin server? For example, say I have
a site hosted in the US with a large file, say 500MB. 

A proxy cache is in tokyo, where the end-user is. Can nginx open
multiple threads when downloading that 500MB file from the US, which
would theoretically allow the uplink to be maxed (or very close) and
serve the file faster to the user, even though its not actually cached
(yet)?

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,166621,166621#msg-166621