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Showing content from https://developer.mozilla.org/en-US/docs/Web/Security/Practical_implementation_guides/MIME_types below:

MIME type verification - Security

MIME type verification

The X-Content-Type-Options header informs browsers not to load scripts and stylesheets unless the server indicates the correct MIME type.

Problem

Without proper MIME type verification, browsers might incorrectly detect non-script and non-stylesheet files as scripts or stylesheets. This error allows potentially malicious files to be loaded via <script> and <link> elements as part of Cross-site scripting (XSS) attacks.

Solution

All sites must set the X-Content-Type-Options header with a value of nosniff, and set appropriate MIME types for the files they serve (i.e., via the Content-Type header).

nosniff blocks a request if the request destination:

Examples

Prevent browsers from incorrectly detecting non-stylesheets as stylesheets and non-scripts as scripts:

X-Content-Type-Options: nosniff
See also

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