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Editorial Team
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Asked: 2026-06-02T06:58:36+00:00

I have a MVC3 site running on IIS 7.5 that has compression enabled. The

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I have a MVC3 site running on IIS 7.5 that has compression enabled.

The GZip compression is working on all pages of the site except for a few pages where I manually change the content type to application/xhtml+xml (this is necessary for various reasons) in the controller (Response.ContentType = "application/xhtml+xml";).

What about this content type would cause GZip not to work, and is there any way around that?

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  1. Editorial Team

    application/xhtml+xml is not one of the built in mime types that IIS compression knows to compress. You must enable compression for this mime-type explicitly.

    I’ll assume you want the compression to be enabled whether it’s a static file or dynamically generated. To do this you must add the mime-type to the machine level config’s system.webServer/httpCompression staticTypes and dynamicTypes sections. One of the simpler ways to do this with a deployment script is to just use appcmd.exe like so:

    Adding support for compressing static content

    appcmd.exe set config -section:system.webServer/httpCompression /+"staticTypes.[mimeType='application/xhtml%%2bxml',enabled='True']" /commit:apphost

    Adding support for compressing dynamic content

    appcmd.exe set config -section:system.webServer/httpCompression /+"dynamicTypes.[mimeType='application/xhtml%%2bxml',enabled='True']" /commit:apphost

    Obviously you can use this same approach for any other content types you might want compressed.

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