I have IIS 7.5 with static and dynamic compression enabled. It seems to work fine for dynamic files, but for static ones it behaves erratically, often sending a http header "Content-Encoding: gzip" when the content is not compressed. This causes browsers to attempt to uncompress, throwing an invalid magic number error. Here's my configuration:
<httpCompression dynamicCompressionDisableCpuUsage="95" dynamicCompressionEnableCpuUsage="70" >
<scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" />
<dynamicTypes>
<add mimeType="text/*" enabled="true" />
<add mimeType="application/javascript" enabled="true" />
<add mimeType="application/x-javascript" enabled="true" />
<add mimeType="application/json" enabled="true" />
<add mimeType="*/*" enabled="false" />
</dynamicTypes>
<staticTypes>
<add mimeType="text/*" enabled="true" />
<add mimeType="message/*" enabled="true" />
<add mimeType="application/javascript" enabled="true" />
<add mimeType="application/x-javascript" enabled="true" />
<add mimeType="*/*" enabled="false" />
</staticTypes>
I thought some http module was uncompressing the content somewhere down the pipe, but none of them seem suspicious. Any ideas?
Try to enable dynamic compression before cache which is disabled by default.
<urlCompression dynamicCompressionBeforeCache="true" doDynamicCompression="true" doStaticCompression="true" />
I have found out in my investigations that using HttpContext.RewritePath() on a static file causes this problem.
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