How to troubleshoot why the IIS7 site is not gzip compressing

I've got a number of websites on a single IIS7 machine running W2K8.

I'm using Fiddler to help me figure out if something is compressed or not. Nothing is.

So, I've googled for a few things and tried some things out. I have the following …

C:\Windows\System32\inetsrv>appcmd set config -section:urlCompression /doDynamic
Compression:true
Applied configuration changes to section "system.webServer/urlCompression" for "
MACHINE/WEBROOT/APPHOST" at configuration commit path "MACHINE/WEBROOT/APPHOST"

C:\Windows\System32\inetsrv>appcmd list config -section:urlCompression
<system.webServer>
  <urlCompression doDynamicCompression="true" />
</system.webServer>

C:\Windows\System32\inetsrv>appcmd list config -section:serverRuntime
<system.webServer>
  <serverRuntime frequentHitThreshold="1" />
</system.webServer>

I've made sure that the urlCompression, httpCompression and serverRuntime sections are unlocked.

I've also added the following to my web.config :-

<system.webServer>
    <serverRuntime frequentHitThreshold="1" frequentHitTimePeriod="00:10:00" />
    <!-- NOTE: This requires the following section to be unlocked: appcmd set config -section:urlCompression /doDynamicCompression:true -->
    <urlCompression doDynamicCompression="true" dynamicCompressionBeforeCache="true" />
    <httpCompression noCompressionForHttp10="False" noCompressionForProxies="False">
        <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" dynamicCompressionLevel="4" staticCompressionLevel="9" />
        <dynamicTypes>
            <clear />
            <add mimeType="*/*" enabled="true" />
        </dynamicTypes>
        <staticTypes>
            <clear />
            <add mimeType="*/*" enabled="true" />
        </staticTypes>
    </httpCompression>
    <caching>
        <profiles>
            <add extension=".css" policy="CacheUntilChange" kernelCachePolicy="DontCache" duration="07:00:00" location="Any" />
            <add extension=".js" policy="CacheUntilChange" kernelCachePolicy="DontCache" duration="07:00:00" location="Any" />
            <add extension=".png" policy="CacheUntilChange" kernelCachePolicy="DontCache" duration="07:00:00" location="Any" />
            <add extension=".jpg" policy="CacheUntilChange" kernelCachePolicy="DontCache" duration="07:00:00" location="Any" />
            <add extension=".jpeg" policy="CacheUntilChange" kernelCachePolicy="DontCache" duration="07:00:00" location="Any" />
            <add extension=".gif" policy="CacheUntilChange" kernelCachePolicy="DontCache" duration="07:00:00" location="Any" />
            <add extension=".zip" policy="CacheUntilChange" kernelCachePolicy="DontCache" duration="07:00:00" location="Any" />
            <add extension=".htm" policy="CacheUntilChange" kernelCachePolicy="DontCache" duration="07:00:00" location="Any" />
        </profiles>
    </caching>
    <staticContent>
        <clientCache cacheControlMaxAge="31.00:00:00" cacheControlMode="UseMaxAge" />
    </staticContent>
....
</system.webServer>

So checking this, i'm not sure what i've done wrong … ??? any suggestions? how can i debug this to see what's not getting read it right, etc?

I've also been doing 'force-refresh' when I grab the website content, etc. Definately not getting server-compressed 🙁

Please help!

Update 1: Browser request does include an Accept-Encoding: gzip, deflate .