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Scheme

The portion of a URL that names the protocol used (http, https, ftp, etc.), the first piece that tells the browser how to fetch the resource. Foundational to reading URLs and understanding web requests.

A URL's scheme (http://, https://, ftp://, etc.) tells the client which protocol to use. For defenders, scheme matters: http indicates unencrypted communication, https indicates encrypted, and unusual schemes can hint at unexpected behavior. Reading URLs starts with the scheme, and understanding it is part of foundational web-defense literacy, alongside the other URL components (host, path, query string, fragment).

Introduced in: Defensive Web Fundamentals

Examples

  • Recognizing https:// as a TLS-protected scheme versus plain http://.
  • Spotting an unexpected scheme in a URL during log review.
  • Reading the scheme first when parsing a URL.

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