jsonWebKeySetUrl

The "jku" (JWK Set URL) Header Parameter is a URI (RFC3986) that refers to a resource for a set of JSON-encoded public keys, one of which corresponds to the key used to digitally sign the JWS. The keys MUST be encoded as a JWK Set (JWK). The protocol used to acquire the resource MUST provide integrity protection; an HTTP GET request to retrieve the JWK Set MUST use Transport Layer Security (TLS) (RFC2818) (RFC5246); and the identity of the server MUST be validated, as per Section 6 of RFC 6125 (RFC6125). Also, see Section 8 on TLS requirements. Use of this Header Parameter is OPTIONAL.