How to grab a part of web page?

[A]

Hi,
Is it possible to download only a part of web page?
Say I need to find out an information about a customer that starts 
at 1500 byte position and ends at 2000 byte position. If the whole 
page has about 100 kb it seems to me waste of time to load all the 
page.
What is the best, yet easy, solution?
Is it possible to use httplib or necessary socket module?
Thank you for help.
Ladislav