The X-Content-Type-Options header in web security is used to prevent browsers from MIME-sniffing a response away from the specified content type. When set to the value nosniff, it instructs the browser not to override the Content-Type header set by the server, mitigating potential MIME-based attacks. This protection ensures that web resources are served and interpreted strictly as intended by the server.

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Header	Value
X-Content-Type-Options	nosniff
X-Content-Type-Options	nosniff

Multiple X-Content-Type-Options headers are not allowed.

When the X-Content-Type-Options HTTP header has multiple values, it leads to non-standard behavior and may result in unpredictable handling by different browsers. Some browsers might use the first or last value, while others could ignore the header entirely, potentially defaulting to MIME type sniffing. For reliable and consistent security, it's best to use only a single, correct value (nosniff) for this header. Multiple values can undermine the intended security benefits of the "nosniff" directive.