Hi,
I have two identical 64 bit Windows 2008 R2 Servers running IIS 7.5 (Production and QA).
Both have Dynamic Compression installed, enabled and configured in the same way.
Issue:
My Production server does NOT do dynamic gzip compression of ANYTHING, while the QA server DOES gzip compress what I expect it to.
The Good News is that the Failed Request Tracing Log shows a reason:
Reason Code: 12 NO_MATCHING_CONTENT_TYPE
The Bad News is that the compression settings in the applicationHost.config file for both servers is identical. I have never edited them by hand, I have WinMerge compared them (including whitespace) and I'm not configuring anything related to this in the web.config.
Here are the two compression related sections:
<section name="httpCompression" allowDefinition="AppHostOnly" overrideModeDefault="Deny" />
<httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files">
<scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" />
<staticTypes>
<add mimeType="text/*" enabled="true" />
<add mimeType="message/*" enabled="true" />
<add mimeType="application/x-javascript" enabled="true" />
<add mimeType="application/atom+xml" enabled="true" />
<add mimeType="application/xaml+xml" enabled="true" />
<add mimeType="*/*" enabled="false" />
</staticTypes>
<dynamicTypes>
<add mimeType="text/*" enabled="true" />
<add mimeType="message/*" enabled="true" />
<add mimeType="application/x-javascript" enabled="true" />
<add mimeType="*/*" enabled="false" />
</dynamicTypes>
</httpCompression>
To me, it seems like with the configuration above, I should NOT get NO_MATCHING_CONTENT_TYPE. An ASPX files returns a content type of text/html and the configuration clearly shows that mimeType text/* is enabled.
Given the error message, I would think that many of the things I've checked in the following section shouldn't even apply (permissions / compression disable and enable cpu settings, etc...) but I wanted to look at everything as the possible cause.
More Info:
1. Keeping it simple, I'm only focusing on ASPX pages now (I'm trying to get "out of the box" compression to work, not something special like JSON...)
2. I believe that when I spun up these servers 6 months ago and configured compression, I verified that it worked from both of them. I haven't changed any config settings since then, so take this info for what it is worth.
3. I've gone through the following and they have not solved my problem:
www.iis.net/learn/troubleshoot/performance-issues/troubleshooting-iis-compression-issues-in-iis6-iis7x
stackoverflow.com/a/7634875/1131855
4. I have compared the servers' "Configuration Editor" settings for system.webServer/HttpCompression and both are IDENTICAL.
5. The dynamicCompressionDisableCpuUsage and dynamicCompressionEnableCpuUsage settings are their defaults at 90 and 50. While sometimes the web server CPU might hit 90%, I've monitored it often and it is usually always below 50%.
6. I've checked the permissions of the user I have the ApplicationPool setup to use, and that user has FullControl permissions
7. Here are the Request and Response Headers to the same page on each server:
PRODUCTION (compression not working)
GET /Default.aspx HTTP/1.1
Host: www.sitenameremoved.com
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.89 Safari/537.36
Referer: https://www.sitenameremoved.com/auth/authLogon.aspx
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8
HTTP/1.1 200 OK
Cache-Control: private
Content-Length: 274135
Content-Type: text/html; charset=utf-8
Server: Microsoft-IIS/7.5
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Date: Thu, 19 Mar 2015 12:07:02 GMT
Strict-Transport-Security: max-age=7776000
QA (compression working)
GET /Default.aspx HTTP/1.1
Host: qa.sitenameremoved.com
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.89 Safari/537.36
Referer: https://qa.sitenameremoved.com/auth/authLogon.aspx
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8
HTTP/1.1 200 OK
Cache-Control: private
Content-Type: text/html; charset=utf-8
Content-Encoding: gzip
Vary: Accept-Encoding
Server: Microsoft-IIS/7.5
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Date: Thu, 19 Mar 2015 12:08:16 GMT
Content-Length: 64963
Strict-Transport-Security: max-age=7776000
I've searched to the end of the internet. What am I missing?
Thanks,
Brent