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GZip turned off everywhere but still in headers - IIS Win Server 2012

hi, wonder if you gurus can assist please.

I have a server I'm connecting to (via reverse proxy from another IIS server) but having trouble as gzip is on and I cannot find out why.

I've checked the compression settings on the site, subsite and at global level within IIs

and the following line is also in the

 <scriptResourceHandler enableCompression="false" enableCaching="true" />

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any ideas greatly appreciated please.

Thanks, Neil

Dan McFadden

I would check in the following areas:

1. At the server scope... is this setting enabled or not.
2. Headers can also be controlled in code. I would check the source to see if being set there.

Also, can you post the web.config for the app?

This setting

<scriptResourceHandler enableCompression="false" enableCaching="true" />

does not control compression in the way you understand. This is for ECMAscript/javascript

Reference link: https://msdn.microsoft.com/en-us/library/bb513840(v=vs.100).aspx

This is how you control compression in the web.config: (as an example only)

<httpCompression directory="%SystemDrive%\websites\_compressed" minFileSizeForComp="1024">
    <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" />
    <staticTypes>
        <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" />
    </staticTypes>
</httpCompression>

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Dan

Neil Thompson

ASKER

Thanks Dan

So if I simply used the below would this force everything not to use gzip? do I need to add something about stopping the dynamic bits as well please?

<httpCompression directory="%SystemDrive%\websites\_compressed" minFileSizeForComp="1024">
    <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" />
    <staticTypes>
        <add mimeType="*/*" enabled="false" />
    </staticTypes>
</httpCompression>

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Dan McFadden

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Neil Thompson

ASKER

thanks Dan,

The proxy server is the main web server running IIS, there are 3 outbound rules fixing errors from 3rd party systems that cannot be fixed at the source level themselves unfortunately, hence the need to have the gzip off on the proxied server, add the new headers then send on it's way with gzip in the end.

I'll have a look at your links now and advise.

Neil Thompson

ASKER

Superb, many thanks this worked perfectly for me.

Regards
Neil

https://www.saotn.org/iis-outbound-rules-with-gzip-compression/