GZIP CSS and Javascript files in IIS

Question

I'm trying to deliver to the browser the Compressed & Gzipped version of my javascript files using coldfusion.

I've tried to add the following to the web.config but still not showing GZIP (using Fiddler)

<httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files">
    <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll"/>
    <dynamicTypes>
      <add mimeType="text/*" enabled="true"/>
      <add mimeType="message/*" enabled="true"/>
      <add mimeType="application/javascript" enabled="true"/>
      <add mimeType="*/*" enabled="false"/>
    </dynamicTypes>
    <staticTypes>
      <add mimeType="text/*" enabled="true"/>
      <add mimeType="message/*" enabled="true"/>
      <add mimeType="application/javascript" enabled="true"/>
      <add mimeType="*/*" enabled="false"/>
    </staticTypes>
  </httpCompression>
  <urlCompression doStaticCompression="true" doDynamicCompression="true"/>

I am not sure what is wrong... The browser should un-zip the file so that it can process it. If you look at the transport size in firebug is it smaller than the file size? Also are you serving the js file as a cfm file or purely a js file? — Daniel Sellers
– Daniel Sellers, Commented May 26, 2011 at 15:34

Yannick · Accepted Answer · 2011-05-27 20:34:18Z

3

I solved my problem by installing dynamic compression under IIS Roles Services and now it works like a charm.

answered May 27, 2011 at 20:34

Yannick

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1 Comment

Maxim Mazurok Over a year ago

I can't believe that JS compression was working, but CSS wasn't. And IIS didn't give me any error or warning! Your answer helped, thanks!

Daniel Sellers · Accepted Answer · 2011-05-26 15:54:45Z

0

With compression on in IIS there is no need to pre-compress the .js files. The server will manage compressing, checking for browser support and sending the compressed file when it is supported without you doing any work on your end.

You just need to put the js file on the server and you should be good to go. Just use the normal file name in the src for the script tag and the server will manage all of the rest of it. Since it is not a ColdFusion file the ColdFusion server doesn't ever touch it.

answered May 26, 2011 at 15:54

Daniel Sellers

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4 Comments

Yannick Over a year ago

But then why I get in YSlow (firebug plugin) the message "There are x plain text components that should be sent compressed with gzip"

Yannick Over a year ago

Because if I understand right Compression and gzip are different layer of compression...So IIS take care of compression but I assume that Coldfusion (in my case) would take care of delivering the gzip files

Henry Over a year ago

verify with Fiddler like this: blogs.msdn.com/b/vivekkum/archive/2009/02/18/…

Daniel Sellers Over a year ago

Compression from IIS should be gzip, or a format that the browser sends in its accepts header.

donquist · Accepted Answer · 2011-05-26 15:57:32Z

0

Isn't the browser just uncompressing it, like it should, and your seeing the the end result. You could also use cfhttp to hit the same url, and see what it returns. With that, you can easily control and see what is compressed or uncompresed.

answered May 26, 2011 at 15:57

donquist

1

Comments

Paul Perigny · Accepted Answer · 2011-05-26 18:06:31Z

0

Only use the compression option in IIS, and directly link to the JS / CSS files, don't serve them via ColdFusion.

The content in your browser window has been minified, not compressed.

Browsers are aware of compressed content; the browser will tell the server what formats (if any) that they can handle. The compressed js file is automatically decompressed by the browser before you see it. This is why the content is see is plain text.

As for YSlow, make sure it is not complaining about uncompressed CSS files.

answered May 26, 2011 at 18:06

Paul Perigny

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Comments

dplante · Accepted Answer · 2012-05-30 16:36:54Z

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It looks like you've specified that the MIME type "application/x-javascript" should be compressed by IIS. However, you are returning the MIME type "application/javascript" from ColdFusion.

edited May 30, 2012 at 16:36

dplante

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answered May 26, 2011 at 21:27

Ben Doom

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1 Comment

Yannick Over a year ago

I've remove the CF code since IIS should be able to handle it without CF

Ilgın K. Kanat · Accepted Answer · 2016-01-04 18:00:20Z

0

for css compression maybe you guys should try this attribute;

<add mimeType="text/css" enabled="true"/>

and its the entire code(leverage browser caching includes);

<system.webServer>
<httpCompression directory="C:\inetpub\temp\IIS Temporary Compressed Files">
<scheme name="gzip" dll="C:\Windows\System32\inetsrv\gzip.dll"/>
<dynamicTypes>
  <add mimeType="text/*" enabled="true"/>
  <add mimeType="message/*" enabled="true"/>
  <add mimeType="application/javascript" enabled="true"/>
  <add mimeType="*/*" enabled="false"/>
  <add mimeType="text/css" enabled="true"/>
</dynamicTypes>
<staticTypes>
  <add mimeType="text/*" enabled="true"/>
  <add mimeType="message/*" enabled="true"/>
  <add mimeType="application/javascript" enabled="true"/>

  <add mimeType="*/*" enabled="false"/>
  </staticTypes>
</httpCompression>
<urlCompression doStaticCompression="true" doDynamicCompression="true"/>
<staticContent>
<clientCache cacheControlMode="UseMaxAge" cacheControlMaxAge="365.00:00:00"/>
</staticContent>
</system.webServer>

answered Jan 4, 2016 at 18:00

Ilgın K. Kanat

1

1 Comment

Rich Over a year ago

Doesn't <add mimeType="text/*" enabled="true"/> already cover all text MIME types, including text/css?

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