Skip to content

PATTERN Cited by 1 source

Forwarded header transitive trust

Use the RFC 7239 Forwarded HTTP header to carry operator identity and content-use intent through proxy chains, enabling site owners to grant access to known operators regardless of how many intermediary layers sit between the operator and the site.

Problem

AI agents increasingly act through platforms and intermediaries. A site owner trusts Stripe, but a request arrives via three layers of orchestration from an unknown developer using Stripe's tools. There's no standard way to propagate "who is ultimately responsible for this request" through the chain.

Solution

Extend use of the existing RFC 7239 Forwarded header (designed to "allow proxy components to disclose information lost in the proxying process"):

Forwarded: for="openai";use="reference"
  • for= identifies the operator (analogous to what X-Forwarded-For does for IP addresses).
  • use= declares content-use intent (composing with the content-use signaling framework).

When a site owner says "allow this operator," the preference holds whether the operator arrives directly or through trusted intermediaries.

Consequences

  • Portable trust: operators carry their reputation with them across any number of intermediary hops.
  • Deterrent with teeth: losing Verified status across >20% of web domains (Cloudflare's network) is meaningful.
  • Leverages existing standard: no new protocol needed — RFC 7239 is already deployed.
  • Privacy limitation: favors identifiable operators; small/privacy-sensitive actors cannot participate without revealing identity.
  • Forgery risk: adversarial intermediaries could inject false for= values; requires trusted TLS termination at the edge to validate.

Known Uses

Seen In

Last updated · 564 distilled / 1,671 read