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hyperxpro
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Jul 25, 2026
Realm.Builder.ha2 writes A2 into the recycled StringBuilder that newResponse took from StringBuilderPool, but on the auth-int branch with no precomputed entity-body hash it called StringUtils.toHexString, which takes that same thread-local builder and resets it. The "POST:/secret:" already written was discarded and A2 came out as the empty-body hash twice, so the Digest response no longer bound the request method or the target URI. Appending with appendBase16 keeps the hash in the buffer already being built, which is what ha1 and newResponse already do for HA1 and HA2. The two encoders emit identical lowercase, zero-padded hex, so the digest is unchanged everywhere the branch was already correct. Latent since #2148 replaced the EMPTY_ENTITY_MD5 constant with a computed hash. The null-entityBodyHash branch is no longer reachable from the request pipeline: #2276 wired setEntityBodyHash into perRequestAuthorizationHeader and computeBodyHash never returns null, so no wrong header reaches the wire today. It is still reached by the nextnonce rotation in Interceptors and by Realms built through the public API. The added RealmTest case checks the response against the RFC 7616 A2 and fails on the current code.
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Motivation:
Achieve full RFC 7616 compliance for HTTP Digest Authentication — supporting stale nonce recovery, nonce count tracking, userhash, Authentication-Info processing, multiple challenge negotiation, algorithm-aware auth-int, and Proxy-Authenticate parity.
Modification:
Result:
Fixes #2068