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Fragment

The part of a URL after the '#' symbol, used to point to a location within a page. It is handled by the browser and not normally sent to the server, which matters when reasoning about what a server actually receives.

In a URL, the fragment follows a hash and typically identifies a section within the page (like an anchor) or holds client-side state in some apps. Crucially, browsers do not send the fragment to the server in the request, so a server never sees it. Understanding this helps defenders reason accurately about what data reaches the server versus stays in the browser, which matters for analyzing requests and certain client-side behaviors.

Introduced in: Defensive Web Fundamentals

Examples

  • The '#section2' at the end of a URL pointing to a spot on the page.
  • A fragment holding client-side state that the server never receives.
  • Recognizing that the fragment is not part of the request sent to the server.

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