[jdk17u-dev] RFR: 8293786: HttpClient will not send more than 64 kb of data from the 2nd request in http2

[Goetz Lindenmaier]

I would like to fix this issue along with the large http2 remake of 17.

Resolved one import in a test file. probably clean.

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Commit messages:
 - backport ad90fb6da38da066dfc7a5439196887bbcda766f

Changes: https://git.openjdk.org/jdk17u-dev/pull/3795/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3795&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293786
  Stats: 237 lines in 6 files changed: 220 ins; 4 del; 13 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3795.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3795/head:pull/3795

PR: https://git.openjdk.org/jdk17u-dev/pull/3795