[jdk17u-dev] RFR: 8347995: Race condition in jdk/java/net/httpclient/offline/FixedResponseHttpClient.java

[Paul Hohensee]

Backport for parity with Oracle 21.0.8 (applies also to 17, hence this backport). Clean, low risk: test only, modified test passes.

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Commit messages:
 - Backport a62a870150cf199f16277b478af2f5d937255b3c

Changes: https://git.openjdk.org/jdk17u-dev/pull/3535/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3535&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347995
  Stats: 14 lines in 1 file changed: 10 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3535.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3535/head:pull/3535

PR: https://git.openjdk.org/jdk17u-dev/pull/3535