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I've managed to set up compression for a custom mime type on IIS 7.5 with no problem. Add the mime type to IIS then add it to the httpCompression element in applicationHost.config. But when I do the same thing on IIS 7, the particular mime type is never compressed. This isn't a problem with compression in general since other mime types are compressed correctly. As far as I can tell, IIS 7 and IIS7.5 are configured in exactly the same way. Does IIS7 behave differently and do I need to do something else to get it working?

I've setup failed request tracing and get a NO_MATCHING_CONTENT_TYPE error during compression but I can't figure out what else I need to do to tell IIS about my mime type

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migrated from stackoverflow.com Apr 1 '11 at 13:00

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Post the relevant portions of applicationHost.config. What specific MIME Type doesn't compress? –  Mathias R. Jessen Feb 12 '12 at 0:19

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Suggestion! Either use an XML-capable comparison tool like BeyondCompare, or like Web Deployment Tool (-verb:sync -whatif) to compare configurations, particularly at the applicationhost.config level.

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Thanks, there are some differences between the applicationHost.config files but nothing that looks like it would explain the difference –  Doogal Apr 11 '11 at 16:24
    
It'd help to have comparative FREB logs. Otherwise - does the Windows level know about the file type on one, and not the other? (is the Mime type registered in the registry on one of the boxes?) –  TristanK Apr 12 '11 at 7:46

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