X-Content-Type-Options has an incorrect value

Rule from http under security category

What is a trooper!

we have submitted your edit to the community for review! We'll review and make it live on the site in the next few hours, the internet thanks you :).

Browse another section of the knowledge base

Suggest an edit


This rule has no content... yet.

Add content to this rule

Or just browse to view rules that have content


It is recommend to disable sniffing for content-type. This is done with the X-Content-Type-Options: nosniff header, which is expected on your response.

The header was found but was not configured configured according to the recommendation of disabling content sniffing with nosniff.

The recommended value we require is:

X-Content-Type-Options: nosniff

How do I fix this ?

Simply configure the header according to the following recommendation.

Although you may set http headers in your application code it is often simpler to configure the web server to set it properly.

// nginx
add_header X-Content-Type-Options nosniff;

// apache
<IfModule mod_headers.c>
  Header set X-Content-Type-Options: nosniff

Else the application code needs to be updated to output the header as such:

X-Content-Type-Options: nosniff

This will disable content sniffing on older browsers like IE6.


Browse another section of the knowledge base

Signup icon
Ready to see how well your site scores?

Passmarked works best when you have an account. It allows you to keep a dashboard with saved data of the sites you have run through the system, we’ll alert you about important updates and you get access to the Passmarked Slack forum.

Sign up to get started