> For the complete documentation index, see [llms.txt](https://clients.medianova.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://clients.medianova.com/products/performance-cdn/static-content-delivery/advanced-configuration/headers/x-content-type-options.md).

# X-Content Type Options

The X-Content-Type-Options feature adds the `X-Content-Type-Options` header to viewer responses. This header instructs compatible browsers not to perform MIME sniffing and to rely strictly on the `Content-Type` declared by the server. Disabling MIME sniffing helps reduce exposure to certain injection and cross-site scripting (XSS) vectors.

{% hint style="info" %}
The feature does not modify origin requests or CDN caching behavior.
{% endhint %}

### How X-Content-Type-Options Works

You can configure X-CDN Header in the [Medianova Control Panel](https://cloud.medianova.com) or via [API](https://clients.medianova.com/api-documentation/performance-cdn/headers#put-api-v1-cdn-organization_uuid-resource-resource_uuid-6)

When enabled:

* The CDN adds the following header to viewer-facing responses:

  ```
  X-Content-Type-Options: nosniff
  ```
* Browsers that support this header will not attempt to infer content types and will instead enforce the value provided by the origin.
* MIME sniffing is disabled for resources such as scripts, stylesheets, and other content types that could be misinterpreted.

<figure><img src="/files/7OLnDjGCAcRiLhIZX5Mh" alt=""><figcaption><p>X-Content-Type-Options toggle inside the Headers tab</p></figcaption></figure>

### Use Cases

#### Prevent MIME sniffing

Ensure the browser does not guess content types, avoiding scenarios where a file may be interpreted as executable code.

#### Improve XSS resilience

Reduce attack surfaces where incorrect content-type interpretation could lead to script execution.

#### Enforce strict content handling

Guarantee consistent behavior across browsers by ensuring content is processed exactly as declared.

### Notes

* The header is applied only to **viewer responses**, not to origin-bound requests.
* Modern browsers widely support `nosniff`, but legacy browsers may behave inconsistently.
* Enabling this header does not alter your CDN caching logic.
* Correct MIME types must still be set by your origin; this header does not correct misconfigured content types.


---

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