keep method and digest-uri in A2 for qop=auth-int#2269
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## Summary - pass the auth-int entity-body hash to the request-specific `Realm.Builder` - build the preemptive Digest realm once for origin and proxy authentication - remove the duplicate digest-response implementation that was recalculating HA1 and whose result was overwritten by the final build - verify the emitted origin and proxy responses against an independent MD5 calculation This follows the entity-body-hash flow already used by the 401 and 407 interceptors. It does not modify `Realm.java`, so it remains compatible with #2269. ## Verification - `./mvnw -pl client -Dtest=org.asynchttpclient.util.AuthenticatorUtilsTest,org.asynchttpclient.RealmTest,org.asynchttpclient.DigestAuthTest,org.asynchttpclient.DigestAuthRfc7616Test test` (53 tests passed) - `./mvnw -B -ntp -pl client -DskipTests -Dmaven.javadoc.skip=true -Dgpg.skip=true verify` (Revapi passed) The full JDK 11 `./mvnw clean verify` gate was not run because this environment provides JDK 21 only. Codex on behalf of Pavel Ptashyts Co-authored-by: Codex <codex@openai.com>
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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 calls toHexString, which takes that same thread-local builder and resets it, so the "POST:/secret:" already written is discarded. A2 comes out as the empty-body hash twice and the Digest response no longer binds the request method or the target URI. A server reaches this by answering with qop="auth-int" in WWW-Authenticate or Proxy-Authenticate, since parseRawQop picks auth-int when that is the only value offered.
Appending with appendBase16 keeps the hash in the buffer already being built, which is what newResponse does for HA1 and HA2 a few lines below. The added RealmTest case checks the response against the RFC 7616 A2 and fails on the current code.