RFR: 6968351: httpserver clashes with delayed TCP ACKs for low Content-Length [v26]

[robert engels]

> fix bug JDK-B6968351 by avoiding flush after response headers

robert engels has updated the pull request incrementally with two additional commits since the last revision:

 - update copyright date
 - update copyright date

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18667/files
  - new: https://git.openjdk.org/jdk/pull/18667/files/e3b9b724..35a7883b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18667&range=25
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18667&range=24-25

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/18667.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18667/head:pull/18667

PR: https://git.openjdk.org/jdk/pull/18667