X-Content-Type-Options: nosniff

To prevent XSS/CSRF exploits in MSIE8 and newer, it’s often best to close as many attack vectors as possible. An easy one to implement is an HTTP Header to prevent MSIE from “sniffing” the content to change it when incorrect.

Example: we would not want an HTML page intentionally served with ‘text/plain’ to be rendered as HTML.


X-Content-Type-Options: nosniff
Content-Type: text/plain

This could be added programatically to pages in your application, via a servlet or servlet filter or added to the httpd.conf file.

Apache2 example: httpd.conf

<IfModule headers_module>
Header set X-Content-Type-Options nosniff
</IfModule>

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