Picto thématique

Rule n° 202 - The server indicates each resource’s MIME type.

Indicating the MIME type of each resource allows the user's browser to retrieve correctly identified contents, and to close the door to the sending of certain dangerous contents.

#Security #Development


  • Reduce the risk of downloading dangerous hidden content.


Configure the server to address for each resource (text, image, script, etc.) the ContentType header filled with the appropriate MIME type, for example:
  • text/html;
  • application/pdf.


Using an HTTP headers inspection tool, check that the ContentType has the value corresponding to the type of resource.

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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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