So I set up gzip compression within IIS 6.
I enabled the compression for both static files and application files. I set up a temp directory with the size of 1,024 MB.
I modified the Metbase to include: htm,html,js,css,aspx,xml
I set the compression level to 9.
I added a WSE, called HttoCompression and set it to the gzip.dll aset it to “Allow”.
I reset IIS.
I notice that my css, xml and js files are being compressed, but ASPX pages are not.
Did I miss something?
By default static file types .txt, .htm, and .html & dynamic file types .exe, .dll, and .asp are set for compression in IIS.
So to add other file types you need to configure custom settings for each compression option by editing the metabase or alternatively — in the case of the compression directory — by using IIS Manager.
For more explanations plz visit http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/25d2170b-09c0-45fd-8da4-898cf9a7d568.mspx?mfr=true