Here are some nice step by step directions for getting HTTP Compression setup in IIS6.
They also link to a nice site that will do a compression test for you on the public side.
I was trying to test stuff that wasn’t public, so I figured out how to test this with Fiddler.
Once you start a trace with fiddler, if you select a session, they will check a box next to the type of compression None/GZIP/Deflate, which was used.
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Image may be NSFW.Clik here to view.
