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I'm trying to get Dynamic Compression on IIS 8.5 to work (particularly with JSON). I'm using Windows Server 2012, IIS 8.5 and a very simple ASP.NET MVC site returning an ActionResult in the form of JSON. Firstly I have done all the usual steps, enabling Dynamic Compression in IIS at the server and site level, edited my applicationHost.config with the correct MIME types, frequency etc.
I have enabled FailedRequestTrace logging, and what is strange is that my request is reporting a successful compression, however Chrome/Fiddlr disagree:
And the response in Trace logging contains the header "Content-Encoding: gzip":
But the response in Chrome/IE/Fiddlr does not contain that header nor is the response compressed, it would appear that something else is interfering! Please help!
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IIS Dynamic Compression configuration: Dynamic compression is a feature that allows the IIS web-server to compress responses coming from such handlers as the ASP.net Managed Handler, ISAPI Extensions or CGI handlers that dynamically generate responses for requests they handle.
Select the Internet Information Services (IIS) Manager under Roles > Web Server (IIS). In the IIS Manager, select the desired Site and open the Compression option (Features View). In the Compression window, mark the check box corresponding to the Enable dynamic content compression option.
In Control Panel, click Programs and Features, and then click Turn Windows features on or off. Expand Internet Information Services, expand World Wide Web Services, expand Performance Features, and then select Dynamic Content Compression and/or Static Content Compression. Click OK. Click Close.
If the server is serving the response zipped (use WireShark to determine this) but you are seeing the response deflated in the browser it's likely to be your antivirus unzipping before the content gets to your browser
WireShark
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