Need help with some IIS7 web.config compression settings

Solution 1:

Pay close attention to the fact that the IIS 7.x web.config setting of

noCompressionForProxies="false"

Is not honored at the web.config level. It must be set in C:\Windows\System32\inetsrv\config\ApplicationHost.config like so:

<httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files" noCompressionForProxies="False">

Be sure and perform an IIS reset after changing the setting.

A request is determined to be from a proxy by IIS if the client's web request has the HTTP "Via" header like so:

Via: 1.1 foo

Solution 2:

After a fair bit of research, it is 'locked' by default at the application level. As such, it needs to be 'unlocked'. this can be achieved via the command line or via the (extra download) iis7 admin tools.

eg. appcmd set config -section:urlCompression /doDynamicCompression:true

Refrences:

• Changes to Compression in IIS7
• Dynamic Compression HowTo