Failed to decode downloaded font, OTS parsing error: invalid version tag + rails 4

I am doing assets pre-compile, and running the application in production mode. After compilation when I load the my index page I got followings warnings in the chrome console:

Failed to decode downloaded font: http://localhost:3000/fonts/ionicons.ttf?v=2.0.0
prospects:1 OTS parsing error: invalid version tag
Failed to decode downloaded font: http://localhost:3000/fonts/ionicons.woff?v=2.0.0
prospects:1 OTS parsing error: invalid version tag

The issue is its not loading icons instead of that its showing squares.

we used the custom fonts and the code is:

@font-face {
  font-family: 'icomoon';
  src: font-url('icomoon.eot');
  src: font-url('icomoon.eot?#iefix') format('embedded-opentype'),
       font-url('icomoon.ttf') format('truetype'),
       font-url('icomoon.woff') format('woff'),
       font-url('icomoon.svg#icomoon') format('svg');
  font-weight: normal;
  font-style: normal;
}

I don't know what is missing from my end . I searched a lot and also tried solution but not got any success.In development mode its working fine but don't know why its showing square in the production mode.

Solution 1:

I got the exact same error, and in my case it turned out to be because of a wrong path for the @font-face declaration. The web inspector never complained with a 404 since the dev server we're using (live-server) was configured to serve up the default index.html on any 404:s. Without knowing any details about your setup, this could be a likely culprit.

Solution 2:

If running on IIS as the server and .net 4/4.5 it might be missing mime / file extension definitions in Web.config - like this:

<system.webServer>
	<staticContent>
      <remove fileExtension=".eot" />
      <mimeMap fileExtension=".eot" mimeType="application/vnd.ms-fontobject" />
      <remove fileExtension=".ttf" />
      <mimeMap fileExtension=".ttf" mimeType="application/octet-stream" />
      <remove fileExtension=".svg" />
      <mimeMap fileExtension=".svg" mimeType="image/svg+xml" />
      <remove fileExtension=".woff" />
      <mimeMap fileExtension=".woff" mimeType="application/font-woff" />
    </staticContent>
</system.webServer>