Picto thématique

Rule n° 201 - The headers sent by the server disable automatic detection of each resource’s MIME type.

No, MIME has nothing to do with Marcel Marceau, it's just an identifier for specifying the data format on the Internet. Automatic detection of this format can enable the sending of harmful content to the user computers. Insofar as this automatic detection is not vital, disable it.

#Security #Development


  • Reduce the risk of downloading dangerous hidden content.


Configure the server to address the X-Content-Type-Options header with the value nosniff.


Using an HTTP header inspection tool, check that the X-Content-Type-Options header is present with the value nosniff.

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Business application and benefits

The rules should be applied to your projects from the design phase through to post-implementation , and they should be understood by all professionals with web and customer experience (CX) responsibilities: from strategy to operations, marketers to project managers, and editorial to technical staff. The benefits of using this ruleset are numerous, including improving customer satisfaction, web performance, and e-commerce, and expanding your client base, while also decreasing your errors and costs.

Multidisciplinary verticles - accessiiblity, SEO, e-commerce, ecodesign etc..- starting from the foundational Opquast base.

The objective of these rules and the Opquast community mission is ‘making the web better’ for your customers and for everyone! Opquast rules cover the key major areas of risk that can negatively affect website users such as privacy, ecodesign, accessibility and security.

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