"Content-Length" header

[Justin]

I have a program that downloads files from the web.  There are
instances in which a .info() will not return a "Content-length" header
to me.  Is ther a way to specifically request this header or FORCE it
to be sent?  I know there is some way to get the file size for these
files because Internet Explorer is capable of determining the size on a
cut / paste of the same exact url.