HTTP attack or not?

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Hi all,

My webserver periodically receives HTTP requests
of the following format:

Host: my server IP
Authorization: 5400 bytes of junk

The other day, my very own home computer apparently
sent such a request to the server, which has led me
to believe this is just something that perhaps IE
spews out. I was unusually using IE that day
for testing. Or, I suppose my Windows may be infected
with something.

Anyone have any insights on this?

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