We have some rather lengthy AJAX calls in our app, some of which transmit over 100k of data across a rather slow encrypted network. I'd like to enable G-Zip compression on application/json
to speed this up a bit. However, I'm having a tough time! First, note that the server definitely supports this. application/javascript
and text/*
compress just fine. The first thing I tried was adding the following to web.config
in the <system.webServer>
section:
<httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files">
<scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll"/>
<dynamicTypes>
<add mimeType="text/*" enabled="true"/>
<add mimeType="message/*" enabled="true"/>
<add mimeType="application/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="*/*" enabled="false"/>
</staticTypes>
</httpCompression>
<urlCompression doStaticCompression="true" doDynamicCompression="true"/>
This had no effect. I even enabled "*/*"
on everything just to test.
Next, I dug up the all-powerful applicationHost.config
file. This had:
<section name="httpCompression" allowDefinition="AppHostOnly" overrideModeDefault="Deny" />
Which I changed to:
<section name="httpCompression" allowDefinition="Everywhere" overrideModeDefault="Allow" />
Still no go. I did an iisreset
just to make sure the new setting would take effect.
Lastly, I edited the actual <httpCompression>
section in applicationHost.config
and manually added in:
<add mimeType="application/json" enabled="true" />
Well, this actually worked! However, I feel it's a bit hacky to modify the applicationHost.config
when I'd rather just enable this for a single web application. What am I doing wrong and why can't I override this in web.config
? Thanks!