Google warning: Resource interpreted as Font but transferred with MIME type application/octet-stream

I have a warning in Google for my font-face:

Resource interpreted as Font but transferred with MIME type application/octet-stream: ".../Content/Fonts/iconFont.ttf".

It works even if I have this warning but I prefer avoid this warning.

Here is my declaration:

@font-face {
  font-family: 'iconFont';
     src: url('../Fonts/iconFont.eot?#iefix') format('embedded-opentype'), 
     url('../Fonts/iconFont.svg#iconFont') format('image/svg+xml'), 
     url('../Fonts/iconFont.woff') format('font/x-woff'), 
     url('../Fonts/iconFont.ttf') format('truetype');
  font-weight: normal;
  font-style: normal;
}

I already search on other posts but no luck so far.

Please note that my server is IIS from Microsoft.

Any idea how can I avoid this warning?

Thanks.

You need to add the following types to an .htaccess/IIS:

AddType application/vnd.ms-fontobject .eot
AddType font/ttf .ttf
AddType font/otf .otf
AddType application/font-woff .woff  

Updated .woff type from:

AddType application/x-font-woff .woff

(Thanks to @renadeen in comments below for pointing this out.)

Check out my answer to a similar question here: Font Face not loaded

Taken from here: font-face problem in chrome.

Thanks for the above answer @97ldave, you can add these types to your IIS webServer configuration section if you'd rather not add them directly to your MIME types in your IIS setup. The following shows an example of adding just the .woff type that was missing from our configuration. This fixed the issues with the fonts not appearing in the latest version of Safari (6.0.3) on my iMac.

<system.webServer>
<staticContent>
  <remove fileExtension=".woff" />
  <mimeMap fileExtension=".woff" mimeType="application/x-font-woff" />
</staticContent>
</system.webServer>

Thanks to Jon Samwell (my colleague) for finding this out.

For Nginx: (Path: /etc/nginx/mime.types)

font/ttf 			             ttf;
font/otf 				         otf;
application/x-font-woff          woff;

You dont need application/vnd.ms-fontobject eot; because it exists already.

After that restart Nginx: service nginx restart

Done.

another approach on here: http://zduck.com/2013/google-chrome-and-woff-font-mime-type-warnings/

use below settings on your web.config:

<system.webServer>
<staticContent>
  <mimeMap fileExtension=".woff" mimeType="application/font-woff"/>
</staticContent>
</system.webServer>

Correct MIME types for fonts are:

application/font-ttf              ttf;
application/font-otf              otf;
application/font-woff          	  woff;

If you run a server with nodeJS, this is a nice module to map your mime types

https://github.com/broofa/node-mime

var mime = require('mime');

mime.lookup('/path/to/file.txt');         // => 'text/plain'
mime.lookup('file.txt');                  // => 'text/plain'
mime.lookup('.TXT');                      // => 'text/plain'
mime.lookup('htm');                       // => 'text/html'

mime.extension('text/html');                 // => 'html'
mime.extension('application/octet-stream');  // => 'bin'

Thanks to @the-senator and @97ldave for their answers

for me the error completely disappear just after adding these lines to the web.config

<system.webServer>
<staticContent>
      <remove fileExtension=".woff" />
      <mimeMap fileExtension=".woff" mimeType="application/x-font" />
      <remove fileExtension=".woff2" />
      <mimeMap fileExtension=".woff2" mimeType="application/x-font" />
    </staticContent>
</system.webServer>