.eot - application/vnd.ms-fontobject
.woff - application/font-woff
.ttf - application/x-font-truetype
.svg - image/svg+xml
.otf - application/x-font-opentype
IIS (Web.Config)
<system.webServer>
...
<staticContent>
...
<remove fileExtension=".eot" />
<mimeMap fileExtension=".eot" mimeType="application/vnd.ms-fontobject" />
<remove fileExtension=".woff" />
<mimeMap fileExtension=".woff" mimeType="application/font-woff" />
<remove fileExtension=".ttf" />
<mimeMap fileExtension=".ttf" mimeType="application/x-font-truetype" />
<remove fileExtension=".svg" />
<mimeMap fileExtension=".svg" mimeType="image/svg+xml" />
<remove fileExtension=".otf" />
<mimeMap fileExtension=".otf" mimeType="application/x-font-opentype" />
...
</staticContent>
...
</system.webServer>
Apache (.htaccess)
AddType application/vnd.ms-fontobject .eot
AddType application/font-woff .woff
AddType application/x-font-truetype .ttf
AddType image/svg+xml .svg
AddType application/x-font-opentype .otf
# could use application/octet-stream for default binary file transfer
#AddType application/octet-stream .otf .ttf