HTTP Byte Range Requests

Could someone explain to me what "HTTP Byte Range Requests" are? WSUS would not work behind my hardware Sonicwall without this option enabled. Enabling it was recommended by engineer on a forum.
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StephenMcCollumAsked:
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RichieHindleCommented:
A range request lets an HTTP client (eg. a web browser or a download utility) request just part of a resource.  The main use for this is to resume a broken download.  Say you start downloading a 2MB file and it gets interrupted after 1MB - later on, your download utility can say to the server "please send me the piece from 1MB to 2MB of this file", and then join the two halves together.

It's done using the "Range" request header - the gory details are here: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35.2
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StephenMcCollumAuthor Commented:
Thanks man, could not have explained it better!
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