Sec,fetch,site:,cross,site -

— Indicates the "where" (different domain).

: The browser adds sec-fetch-site: cross-site and sec-fetch-mode: navigate (or cors ). sec,fetch,site:,cross,site

: A user on site-a.com clicks a button that sends a POST to site-b.com . — Indicates the "where" (different domain)

This looks like you're piecing together the technical components of , specifically those used for Cross-Origin Resource Sharing (CORS) and Cross-Site Request Forgery (CSRF) protection. The Concept: Fetch Metadata ( sec-fetch-* ) This looks like you're piecing together the technical

If you are looking for the exact syntax used in a network request, it usually looks like this:

: This is the most critical header in your list. It tells the server the relationship between the request initiator's origin and the target resource's origin.

Modern browsers include a set of HTTP request headers known as . These headers allow servers to make security decisions based on how a request was initiated and where it came from.