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Glossary

HTTP Message Signatures

In short

HTTP Message Signatures: RFC 9421: a way to sign selected HTTP components, carried in Signature-Input and Signature headers. The sourced facts on this site do not use HTTP Message Signatures outside this entry. Example: Cloudflare checks created, expires, nonce and tag in Signature-Input before verifying an Ed25519 signature. After HTTP Message Signatures the glossary lists Visa Intelligent Commerce.

Definition

RFC 9421: a way to sign selected HTTP components, carried in Signature-Input and Signature headers.

Example

Cloudflare checks created, expires, nonce and tag in Signature-Input before verifying an Ed25519 signature. blog.cloudflare.com, read 4 Nov 2026.

Nearby terms

Sources

  1. Cloudflare: Secure agentic commerce, read 4 Nov 2026

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