HTTP registry: alg

Explicitly declared signature algorithm

HTTP parameter values extend negotiation, framing, preferences, range handling, or other protocol components. alg is registered in HTTP Signature Metadata Parameters. Defining reference: RFC 9421, Section 2.3.

httpregistryhttp-message-signaturesignature-metadata-parameters

Identifier (http)

alg

Explicitly declared signature algorithm

Interpret parameters only in the context that defines them; unknown parameters must not silently change security or framing behavior.

This registry value is currently marked active by IANA. Follow the defining specification before sending, accepting, or proxying it.

IANA registry: http-message-signature/signature-metadata-parameters

Registry reference: RFC 9421, Section 2.3

Sources

HTTP Signature Metadata Parameters
RFC 9421, Section 2.3