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POHow do I compress a Json result from ASP.NET MVC with IIS 7.5
 

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  1. POHow do I compress a Json result from ASP.NET MVC with IIS 7.5
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    <p>I'm having difficulty making IIS 7 correctly compress a Json result from ASP.NET MVC. I've enabled static and dynamic compression in IIS. I can verify with Fiddler that normal text/html and similar records are compressed. Viewing the request, the accept-encoding gzip header is present. The response has the mimetype "application/json", but is not compressed.</p> <p>I've identified that the issue appears to relate to the MimeType. When I include <code>mimeType="*/*"</code>, I can see that the response is correctly gzipped. How can I get IIS to compress WITHOUT using a wildcard mimeType? I assume that this issue has something to do with the way that ASP.NET MVC generates content type headers.</p> <p>The CPU usage is well below the dynamic throttling threshold. When I examine the trace logs from IIS, I can see that it fails to compress due to not finding a matching mime type.</p> <pre><code>&lt;httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files" noCompressionForProxies="false"&gt; &lt;scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" /&gt; &lt;dynamicTypes&gt; &lt;add mimeType="text/*" enabled="true" /&gt; &lt;add mimeType="message/*" enabled="true" /&gt; &lt;add mimeType="application/x-javascript" enabled="true" /&gt; &lt;add mimeType="application/json" enabled="true" /&gt; &lt;/dynamicTypes&gt; &lt;staticTypes&gt; &lt;add mimeType="text/*" enabled="true" /&gt; &lt;add mimeType="message/*" enabled="true" /&gt; &lt;add mimeType="application/x-javascript" enabled="true" /&gt; &lt;add mimeType="application/atom+xml" enabled="true" /&gt; &lt;add mimeType="application/xaml+xml" enabled="true" /&gt; &lt;add mimeType="application/json" enabled="true" /&gt; &lt;/staticTypes&gt; &lt;/httpCompression&gt; </code></pre>
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    1. COI cannot use a wildcard mimetype since I'm encountering a strange issue with IE8 - it appears to have difficulty downloading a .zip file when the request is further gzipped by IIS. Firefox 3.5 is unaffected.
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