Enable Http Compression

You can use compression in IIS to improve the response of your web site.

There are two implemented methods for compression:

• Deflate


• GZIP

Navigate to the AdminScripts directory in a command prompt window with administrative privileges. The default script host is wscript. For the purpose of this tip, switch to cscript with the following command

cscript.exe /h:cscript

The following commands will change various compression settings for IIS.

cscript.exe adsutil.vbs set W3svc/Filters/Compression/{GZIP|DEFLATE}/
{HcFileExtensions "StaticFileType" ...}|{HcScriptFileExtensions "DynamicFileType" ...}

Configure static compression

CSCRIPT.EXE C:\Inetpub\AdminScripts\ADSUTIL.VBS SET W3SVC/Filters/Compression/Parameters/HcDoStaticCompression TRUE

CSCRIPT.EXE C:\Inetpub\AdminScripts\ADSUTIL.VBS SET W3Svc/Filters/Compression/GZIP/HcFileExtensions "htm" "html" "js" "txt"

CSCRIPT.EXE C:\Inetpub\AdminScripts\ADSUTIL.VBS SET W3Svc/Filters/Compression/DEFLATE/HcFileExtensions "htm" "html" "js" "txt"

Configure dynamic file compression

CSCRIPT.EXE C:\Inetpub\AdminScripts\ADSUTIL.VBS SET W3SVC/Filters/Compression/Parameters/HcDoDynamicCompression TRUE

CSCRIPT.EXE C:\Inetpub\AdminScripts\ADSUTIL.VBS SET W3Svc/Filters/Compression/DEFLATE/HcScriptFileExtensions "asp" "asmx" "aspx"
CSCRIPT.EXE C:\Inetpub\AdminScripts\ADSUTIL.VBS SET W3Svc/Filters/Compression/GZIP/HcScriptFileExtensions "asp" "asmx" "aspx"

Set the compression level

CSCRIPT.EXE C:\Inetpub\AdminScripts\ADSUTIL.VBS SET W3Svc/Filters/Compression/GZIP/HcDynamicCompressionLevel "9"
CSCRIPT.EXE C:\Inetpub\AdminScripts\ADSUTIL.VBS SET W3Svc/Filters/Compression/DEFLATE/HcDynamicCompressionLevel "9"

Global compression settings

cscript.exe C:\Inetpub\AdminScripts\adsutil.vbs set w3svc/root/DoStaticCompression False
cscript.exe C:\Inetpub\AdminScripts\adsutil.vbs set w3svc/root/DoDynamicCompression False