Enable IIS7 gzip

Question

How can I enable IIS7 to gzip static files like js and css and how can I test if IIS7 is really gziping them before sending to the client

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If you use YSlow with Firebug and analyse your page performance  YSlow will certainly tell you what artifacts on your page are not gzip d

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Another easy way to test without installing anything  neither is it dependent on IIS version  Paste your url to this link - SEO Checkup    To add to web config   http   www iis net configreference system webserver httpcompression

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Try Firefox with Firebug addons installed  I m using it  great tool for web developer   I have enable Gzip compression as well in my IIS7 using web config

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Global Gzip in HttpModule  If you don t have access to the final IIS instance  shared hosting     you can create a HttpModule that adds this code to every HttpApplication Begin Request event    HttpContext context   HttpContext Current  context Response Filter   new GZipStream context Response Filter  CompressionMode Compress   HttpContext Current Response AppendHeader  Content-encoding    gzip    HttpContext Current Response Cache VaryByHeaders  Accept-encoding     true    Testing  Kudos  no solution is done without testing  I like to use the Firefox plugin  Liveheaders  it shows all the information about every http message between the browser and server  including compression  file size  which you could compare to the file size on the server

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If you are also trying to gzip dynamic pages  like aspx  and it isnt working  its probably because the option is not enabled  you need to install the Dynamic Content Compression module using Windows Features    http   support esri com en knowledgebase techarticles detail 38616

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I only needed to add the feature in windows features as Charlie mentioned For people who cannot find it on window 10 or server 2012  find it as below  I struggled a bit  Windows 10    windows server 2012 R2    window server 2016

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For all the poor guys who have to struggle with a german deutsche Server

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Configuration  You can enable GZIP compression entirely in your Web config file   This is particularly useful if you re on shared hosting and can t configure IIS directly  or you want your config to carry between all environments you target    lt system webServer gt     lt httpCompression directory   SystemDrive  inetpub temp IIS Temporary Compressed Files  gt       lt scheme name  gzip  dll   Windir  system32 inetsrv gzip dll   gt       lt dynamicTypes gt         lt add mimeType  text    enabled  true   gt         lt add mimeType  message    enabled  true   gt         lt add mimeType  application javascript  enabled  true   gt         lt add mimeType       enabled  false   gt       lt  dynamicTypes gt       lt staticTypes gt         lt add mimeType  text    enabled  true   gt         lt add mimeType  message    enabled  true   gt         lt add mimeType  application javascript  enabled  true   gt         lt add mimeType       enabled  false   gt       lt  staticTypes gt     lt  httpCompression gt     lt urlCompression doStaticCompression  true  doDynamicCompression  true   gt   lt  system webServer gt    Testing  To test whether compression is working or not  use the developer tools in Chrome or Firebug for Firefox and ensure the HTTP response header is set   Content-Encoding  gzip   Note that this header won t be present if the response code is 304  Not Modified    If that s the case  do a full refresh  hold shift or control while you press the refresh button  and check again

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under windows 2012 r2 it can be found here

User · Answer

You will need to enable the feature in the Windows Features control panel

[iis] Enable IIS7 gzip

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