[Solved] IE9, CSS and webAssets SEC7113

[Joshua]

OK, don't know if anyone is experiencing this yet?  maybe it's just one of my files?

I just installed IE9 beta and when testing my sites the CSS does not load from the handler.  (asset.axd?id=css)

And I get the following message.
"SEC7113: CSS was ignored due to mime type mismatch"

I have my stylesheets in a webAsset group and have them combined.

Does this mean I have to link my stylesheets 'old school'?

thanks in advance.

[T. Tsonev]

Hi Joshua,

I've verified that the Content-Type is set by WebAssetHttpHandler. This can be seen with Firebug, Fiddler or other debugging tool.



I'm attaching you the project that I've used for testing so you can verify my results.

I've also tested with IE9 Beta and IE Platform Preview 7 and the styles were loaded properly. Are you accessing the site directly or through a proxy / firewall?

Regards,
Tsvetomir Tsonev
the Telerik team

[Joshua]

In the project you sent you did not combine all CSS files into a group in the web.config

<telerik>
   <webAssets>
      <styleSheets>
         <add name="a" combined="True">
            <items>
               <add source="telerik.common.css"/>
               <add source="telerik.black.css"/>
               <add source="~/Content/style1.css"/>
               <add source="~/Content/style2.css"/>
               <add source="~/Content/style3.css"/>
            </items>
        </styleSheets>
     </webAssets>
</telerik>

I reference multiple files and combine them.  I followed the documentation exactly and get the SEC7113 error with IE9.

can you replicate this?

[T. Tsonev]

Hi Joshua,

Thank you for the additional details. I've managed to reproduce the problem. It's already fixed in the latest internal build that will be uploaded in a few minutes (version 2010.3.1123).

Greetings,
Tsvetomir Tsonev
the Telerik team

[T. Tsonev]

Hi Joshua,

I'm attaching the hotfix here.

All the best,
Tsvetomir Tsonev
the Telerik team

[Joshua]

You guys are awesome!!  Thanks for the fix.

The MVC extensions product is soo powerful!!  saves me soo much time!

Thanks,

Josh

[Rick]

I wasn't clear what the problem was that caused the issue from the tread (granted I didn't inspect the source), but I have encountered this as well and my symptoms might be different.

It seems if you define a CSS group, set combine to true, but never add a CSS file to the group, the asset handler won't set the MIME type to anything (according to the network sniffer in the IE 9 dev tools).

Does the hotfix address this issue as well?

Rick