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Cross-origin security headers were created to instruct browsers and webservers on how to handle information sharing between different resources. These different resources can be different webservers, processes or different documents or pages in a web browser.

The different Cross-Origin headers are:

  1. CORS: Cross-Origin Resource Sharing
  2. CORP: Cross-Origin Resource Policy
  3. COEP: Cross-Origin Embedder Policy
  4. COOP: Cross-Origin Opener Policy
  5. CORB: Cross-Origin Read Blocking

Cross-origin isolation

The goal of setting a combination of CORS headers is to achieve what we call ‘Cross-origin isolation’. Easily put, it means that either a site is configured not to exchange any information with other sources, or all other sources are specifically allowed. The other way around, the source has also set CORS headers to confirm sharing resources with the mentioned site.

In this article, we provided a more in-depth description of the several Cross-Origin security headers,

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Peter Tak

Peter Tak

Security Officer at Really Simple Plugins

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