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IIS 10 is sending uncompressed version of CSS file

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Draex_

Problem

I'm using IIS 10 to serve a .NET web app. I have Static Compression enabled on IIS server (as is the default). The app contains a big CSS file, which needs to be transferred compressed, but in spite of enabled compression, uncompressed version is being downloaded to the browser.

Screenshot from the developer console: uncompressed file is being transferred

How can I get the server to send the compressed version of the file?

Debugging steps taken

Browser sends proper Accept-Encoding header: the browser accepts compression

On the server, next to my 500 kB file ant-design-blazor.css, the following files have been created:

  • ant-design-blazor.css.br - 46 kB
  • ant-design-blazor.css.gz - 63 kB

I've checked the request in failed request log and found that StaticCompressionModule is being invoked: compression module

I've also added attribute staticCompressionIgnoreHitFrequency="true" to <httpCompression> in applicationHost.config, so the whole section now looks like this:


        <httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files" staticCompressionIgnoreHitFrequency="true">
            <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" />
            <staticTypes>
                <add mimeType="text/*" enabled="true" />
                <add mimeType="message/*" enabled="true" />
                <add mimeType="application/javascript" enabled="true" />
                <add mimeType="application/atom+xml" enabled="true" />
                <add mimeType="application/xaml+xml" enabled="true" />
                <add mimeType="image/svg+xml" enabled="true" />
                <add mimeType="*/*" enabled="false" />
            </staticTypes>
        </httpCompression>

Any ideas why the compression is not working properly?

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djdomi avatar
za flag
djdomi
i am not a pro on IIS as i am not using it only on certain situations, try a look at https://www.codeproject.com/Articles/242133/Making-the-most-out-of-IIS-compression-Part-1-conf - it looks for me a great guide - however as i understand the usage correctly, only in case if CPU is avaible it will be applied
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