Sec,fetch,site:,cross,site -

— Indicates the "what" (data fetch, not an image or script).

: This indicates the request originated from a completely different website (e.g., attacker.com trying to fetch data from yourbank.com ). Value: same-origin : The request started on your own site. sec,fetch,site:,cross,site

: The request started from a related subdomain. The "Post" Connection — Indicates the "what" (data fetch, not an

: A user on site-a.com clicks a button that sends a POST to site-b.com . — Indicates the "what" (data fetch

— Indicates the "where" (different domain).

: 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.