Configuring IIS 7.5 to send JSON responses gzipped,Dynamic Compression

http://stackoverflow.com/questions/11617744/configuring-iis-7-5-to-send-json-responses-gzipped-no-matching-content-type

1.Install Dynamic Compression as IIS feature

2.You want to make sure that the */* mime type is after the types you add. Also make sure that you have installed Dynamic Compression Module using Server Manager (or OptionalFeatures.exe)

This is the command lines I use to make sure a good compression is done. (but make sure you actually have installed Dynamic and Static Compression modules):

run.bat

call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/serverRuntime /frequentHitThreshold:"1"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/urlCompression /doDynamicCompression:"True"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-"dynamicTypes.[mimeType='application/json']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /+"dynamicTypes.[mimeType='application/json',enabled='True']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-"dynamicTypes.[mimeType='application/json; charset=utf-8']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /+"dynamicTypes.[mimeType='application/json; charset=utf-8',enabled='True']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-"dynamicTypes.[mimeType='application/javascript']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /+"dynamicTypes.[mimeType='application/javascript',enabled='True']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-"dynamicTypes.[mimeType='application/x-javascript']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /+"dynamicTypes.[mimeType='application/x-javascript',enabled='True']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-"dynamicTypes.[mimeType='application/x-javascript; charset=utf-8']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /+"dynamicTypes.[mimeType='application/x-javascript; charset=utf-8',enabled='True']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-"dynamicTypes.[mimeType='*/*']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /+"dynamicTypes.[mimeType='*/*',enabled='False']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-"staticTypes.[mimeType='application/javascript']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /+"staticTypes.[mimeType='application/javascript',enabled='True']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-"staticTypes.[mimeType='application/x-javascript']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /+"staticTypes.[mimeType='application/x-javascript',enabled='True']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-"staticTypes.[mimeType='application/x-javascript; charset=utf-8']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /+"staticTypes.[mimeType='application/x-javascript; charset=utf-8',enabled='True']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-"staticTypes.[mimeType='*/*']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /+"staticTypes.[mimeType='*/*',enabled='False']"call %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /noCompressionForHttp10:"False" /noCompressionForProxies:"False" /minFileSizeForComp:"2700"

After running this your %windir%\system32\inetsrv\config\ApplicationHost.config should look something like (note that / is at the bottom):

<httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files" minFileSizeForComp="2700" noCompressionForHttp10="false" noCompressionForProxies="false">    <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" />    <dynamicTypes>        <add mimeType="text/*" enabled="true" />        <add mimeType="message/*" enabled="true" />        <add mimeType="application/json" enabled="true" />        <add mimeType="application/json; charset=utf-8" enabled="true" />        <add mimeType="application/javascript" enabled="true" />        <add mimeType="application/x-javascript" enabled="true" />        <add mimeType="application/x-javascript; charset=utf-8" enabled="true" />        <add mimeType="*/*" enabled="false" />    </dynamicTypes>    <staticTypes>        <add mimeType="text/*" enabled="true" />        <add mimeType="message/*" enabled="true" />        <add mimeType="application/atom+xml" enabled="true" />        <add mimeType="application/xaml+xml" enabled="true" />        <add mimeType="application/javascript" enabled="true" />        <add mimeType="application/x-javascript" enabled="true" />        <add mimeType="application/x-javascript; charset=utf-8" enabled="true" />        <add mimeType="*/*" enabled="false" />    </staticTypes></httpCompression>