; example: ; Proxy‑Authenticate: Digest realm="atlanta.example.com", qop="auth", ; nonce="f84f1cec41e6cbe5aea9c8e88d359", ; opaque="", stale=FALSE, algorithm=MD5
; example: ; nonce rule is as amended by RFC 3310 ; nonce="MzQ0a2xrbGtmbGtsZm9wb2tsc2tqaHJzZXNy9uQyMzMzMzQK="
; example: ; algorithm=AKAv1‑MD5
; AKAv1 RFC 3310 – Section 3.1
; AKAv2 RFC 4169 – Section 5